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348 Articles Related To: previous page < results 1 - 100 >
A synthetic approach to taxane diterpenes. A synthesis of the bicyclo[5.3.1]undecenone ring system
Tetrahedron Letters, Volume 27, Issue 2, 1986, Pages 203-206
Yasuo Ohtsuka, Takeshi Oishi
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1. You are entitled to access the full text of this document
A new synthetic approach to the bicyclo[5.3.1]undecane ring system in taxanes
Tetrahedron Letters, Volume 25, Issue 47, 1984, Pages 5389-5392
Hiroto Nagaoka, Kazunori Ohsawa, Takeshi Takata, Yasuji Yamada
2. You are entitled to access the full text of this document
Synthetic approach to stemodin ring system
Tetrahedron Letters, Volume 17, Issue 34, August 1976, Pages 2997-2998
Probir K. Ghosal, Debabrata Mukherjee, Phanindra C. Dutta
3. You are entitled to access the full text of this document
Intramolecular cyclization of β-(alkoxycarbonyl)allylsilane with conjugated ketone. A new entry to bicyclo[4.3.0]nonane
Tetrahedron Letters, Volume 34, Issue 16, 16 April 1993, Pages 2613-2616
Chiaki Kuroda, Yuki Ohnishi, James Y. Satoh

Graphical Abstract

Bicyclo[4.3.0]nonane carbon framework was synthesized from acylic compound by using intramolecular cyclization between β-(alkoxycarbonyl)allylsilane with α,β-unsaturated ketone.
image

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Synthesis of the tricyclo[9.3.1.03,8]pentadecane (ABC) ring system of taxane diterpenes
Tetrahedron Letters, Volume 35, Issue 20, 16 May 1994, Pages 3255-3258
Miguel A. Romero, Rubén Pérez Franco, Raymundo Cruz-Almanza, Fernando Padilla

Graphical Abstract

A short, stereoselective synthesis of a tetracyclic intermediate containing the taxane ABC ring system is described.
image

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A simple approach to the construction of bicyclo[5.2.1] and [5.3.1] ring systems from bicyclo[2.2.1]Heptane precursors
Tetrahedron Letters, Volume 31, Issue 10, 1990, Pages 1483-1484
Goutam Saha, Atashi Bhattacharya, Supti Saha Roy, Subrata Ghosh

Graphical Abstract


image

6. You are entitled to access the full text of this document
Bridgehead dienes. Thermal generation of the bicyclo[3.3.1]nona-1(2),4(5)-diene (ZZ) ring system
Tetrahedron Letters, Volume 28, Issue 7, 1987, Pages 735-738
K. J. Shea, L. D. Burke

Graphical Abstract

The bicyclo[3.3.1]nona-1(2),4(5)-diene (ZZ) ring system has been generated by type 2 intramolecular Diels-Alder cycloaddition.
image

7. You are entitled to access the full text of this document
A new approach to the bicyclo[3.2.1]octane ring system: Intramolecular michael and aldol reactions of 3-(5-oxohexyl)-2-cyclopentenones.
Tetrahedron Letters, Volume 19, Issue 44, 1978, Pages 4209-4212
Alexandre Alexakis, Marc J. Chapdelaine, Gary H. Posner
8. You are entitled to access the full text of this document
Zur elektronenstruktur vicinaler triketone: Bicyclo[3.1.0]hexan-2.3.4-trione
Tetrahedron Letters, Volume 22, Issue 47, 1981, Pages 4683-4686
Erich Beck, Peter Hofmann, Alexander Sieber
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Reversal of regiospecificity in the kinetic vs. thermodynamic enolization of bicyclic ketones. Direct bridgehead functionalization of the bicyclo[5.3.1]undecane ring system
Tetrahedron Letters, Volume 33, Issue 30, 21 July 1992, Pages 4261-4264
Kenneth J. Shea, Steven T. Sakata

Graphical Abstract

Deprotonation of bicyclo[5.3.1]undecenone 3 gives the more highly substituted bridgehead enolate under conditions of kinetic control. These findings allow for the direct bridgehead functionalization of this important bicyclic skeleton.
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Synthetic approach to grayanotoxins and asebotoxins: a new construction of the a-homograyanotoxane ring system
Tetrahedron, Volume 37, Issue 22, 1981, Pages 3813-3817
Tetsuji Kametani, Hiroo Matsumoto, Toshio Honda, Keiichiro Fukumoto
11. You are entitled to access the full text of this document
Facile approach to the bicyclo[5.3.0]decane ring system; efficient synthesis of (±)-7-epi-β-bulnesene
Tetrahedron Letters, Volume 43, Issue 11, 11 March 2002, Pages 1939-1941
Jalluri S Ravi Kumar, Michael F O'Sullivan, Sarah E Reisman, Catherine A Hulford, Timo V Ovaska
Graphic
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Synthesis of the octahydro-8b-azaacenaphthylene ring system, a portion of the dimeric coccinellid alkaloids
Tetrahedron Letters, Volume 38, Issue 3, 20 January 1997, Pages 347-350
James C. Shattuck, Jerrold Meinwald

Graphical Abstract

Representatives of the octahydro-8b-azaacenaphthylene ring system have been synthesized and functionalized for possible use in a synthesis of the “dimeric” coccinellid alkaloids.
image

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Bicyclic 5-6 Systems with One Bridgehead (Ring Junction) Nitrogen Atom: Four Extra Heteroatoms 1:3
Comprehensive Heterocyclic Chemistry III, 2008, Chapter 11.20, Pages 895-908
G. Hajós, Z. Riedl
14. You are entitled to access the full text of this document
A novel synthesis of bicyclo[3.3.0]oct-1-en-3-ones from cyclobutanones through [chloro(p-tolylsulfinyl)methylidene]cyclobutanes with ring expansion
Tetrahedron Letters, Volume 46, Issue 21, 23 May 2005, Pages 3767-3770
Tadashi Kawashima, Hiroaki Kashima, Daisuke Wakasugi, Tsuyoshi Satoh

Graphical abstract


image

15. You are entitled to access the full text of this document
Reaction of carbenes with bicyclo[2.1.0]pentane
Tetrahedron Letters, Volume 26, Issue 44, 1985, Pages 5399-5402
Gong-Huey Shiue, Ulf Misslitz, Xin-teng Ding, Maitland JonesJr., Armin de Meijere
16. You are entitled to access the full text of this document
Strained ring systems. VI. A facile rearrangement of image-bicyclo[2.2.O]hex-2-yl acetate
Tetrahedron Letters, Volume 9, Issue 12, 1968, Pages 1449-1451
Richard N. McDonald, Gerald E. Davis
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Photoselective bond cleavage of tricyclo[5.3.1.01,7]undecane derivatives. A facile entry to carbocyclic taxane [A,B] ring system
Tetrahedron Letters, Volume 38, Issue 11, 17 March 1997, Pages 1931-1932
Janine Cossy, Samir BouzBouz

Graphical Abstract

The selective control of cyclopropyl bond cleavage of tricyclo[5.3.1.01,7]undecan-2-one by photochemical electron transfer produces a new approach to the construction of the carbon skeleton of the [A,B] ring system of the carbocyclic frame of taxane.
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Rearrangements of free radicals IX : Thermal and photochemical isomerizations of bicyclo(3.2.0)heptenyl radicals
Tetrahedron Letters, Volume 21, Issue 3, 1980, Pages 261-264
Dieter Brandes, Fritz Lange, Reiner Sustmann
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Bicyclo[2.2.2]octylidene
Tetrahedron Letters, Volume 42, Issue 40, 1 October 2001, Pages 6979-6981
Qing Ye, Maitland Jones Jr., Ting Chen, Philip B Shevlin
Bicyclo[2.2.2]octylidene is formed in four quite different ways. Reactions of the nitrogenous precursors do not complicate the chemistry of the carbene. The products are tricyclo[2.2.2.02,6]octane and bicyclo[2.2.2]octene formed in approximately a 70:30 ratio.
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Formation, structure, and conformation of a new ring system: 8,10-dithiabicyclo[5.3.1]undeca-2,5-diene
Tetrahedron Letters, Volume 16, Issue 16, 1975, Pages 1345-1348
E. Cuthbertson, D. D. MacNicol, P. R. Mallinson
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The effect of 1,5-bridging on the solvolytic behavior of the bicyclo[3.1.0]hex-2-yl cation
Tetrahedron Letters, Volume 14, Issue 35, 1973, Pages 3287-3290
Paul G. Gassman, Richard N. Steppel, Eugene A. Armour
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A new method for the preparation of bicyclo[2.1.1]Hexenes
Tetrahedron Letters, Volume 16, Issue 11, 1975, Pages 947-950
Robert G. Carlson, Kenneth D. May
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NMR Studies on 2,3-disubstituted bicyclo(2,2,2)octanes
Tetrahedron, Volume 28, Issue 22, 1972, Pages 5555-5566
A. H. Beckett, R. E. Reid
24. You are entitled to access the full text of this document
Photochlorination of bicyclo[2.2.0]hexane
Tetrahedron Letters, Volume 8, Issue 7, 1967, Pages 603-607
R. Srinivasan, F. I. Sonntag
25. You are entitled to access the full text of this document
The transition metal complex induced rearrangement of bicyclo[2.1.0]pentane to cyclopentene
Tetrahedron Letters, Volume 12, Issue 20, 1971, Pages 1643-1646
Paul G. Gassman, Thomas J. Atkins, J. Trevor Lumb
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Rh(I)-catalyzed ring-closing reaction of allenynes: selective construction of cycloheptene, bicyclo[5.3.0]decadienone, and bicyclo[5.2.0]nonene frameworks
Tetrahedron Letters, Volume 45, Issue 21, 17 May 2004, Pages 4117-4121
Chisato Mukai, Fuyuhiko Inagaki, Tatsunori Yoshida, Shinji Kitagaki
Graphic
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Novel skeletal transformation of bicyclo[3.3.0]octanones to bicyclo[3.2.1]octenes
Tetrahedron Letters, Volume 32, Issue 4, 21 January 1991, Pages 515-516
Takayoshi Yamamoto, Toshiko Eki, Shinji Nagumo, Hiroshi Suemune, Kiyoshi Sakai

Graphical Abstract


image

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The photochemistry of bicyclo(3,2,0)hepta-2,6-dienes: The formation of a tetracyclo(3,2,0,0,2,70,3,6)heptane
Tetrahedron Letters, Volume 14, Issue 7, 1973, Pages 481-484
A. R. Brember, A. A. Gorman, J. B. Sheridan
29. You are entitled to access the full text of this document
Structural isomerism of mono- and sesquiterpenoid skeletons,
Tetrahedron, Volume 32, Issue 21, 1976, Pages 2513-2519
Dennis H. Smith, Raymond E. Carhart
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The preferred conformation of bicyclo[3,3,2]decane
Tetrahedron Letters, Volume 12, Issue 43, 1971, Pages 3985-3986
Martin Doyle, Russell Hafter, William Parker
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Theoretical studies of the conformational control of additions to bicyclo[m.1.0]Alkan-2-ones. Application and validation of the wizard technique
Tetrahedron Letters, Volume 31, Issue 47, 1990, Pages 6811-6814
Daniel P. Dolata, David R. Spina

Graphical Abstract

Conformational analysis of the reaction shown was performed utilizing the author's WIZARD program. The results were validated by a variety of other computational techniques and then used to explain the diastereoselectivity of the reaction.
image

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Application of palladium-catalyzed cycloalkenylation reaction to terpenoid synthesis—novel approach to tricyclo[5.3.1.02,6]undecane derivative and its transformation into bicyclo[5.3.1]undecane ring system
Tetrahedron Letters, Volume 41, Issue 46, 11 November 2000, Pages 8929-8932
Masahiro Toyota*, Marcellino Rudyanto, Masataka Ihara
33. You are entitled to access the full text of this document
Facile construction of the bicyclo[6.4.0]dodecane ring system via intramolecular cyclization of a sulfone stabilized carbanion
Tetrahedron Letters, Volume 34, Issue 44, 29 October 1993, Pages 7017-7018
Erich L. Grimm, Michel L. Coutu, Laird A. Trimble

Graphical Abstract

A new synthetic approach to eight-membered rings has been accomplished via intramolecular cyclization of a sulfone stabilized carbanion.
image

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A novel lithium iodide-promoted vinylcyclopropane-cyclopentene rearrangement: Efficient synthesis of bicyclo[3.3.0]oct-6-en-2-one, versatile building block for polycyclopentanoid natural products
Tetrahedron Letters, Volume 27, Issue 25, 1986, Pages 2885-2888
Shun-ichi Hashimoto, Tomohiro Shinoda, Shiro Ikegami

Graphical Abstract

Bicyclo[3.3.0]oct-6-en-2-one has been synthesized
image
a stepwise [3+2] annulation process involving the combination of Pd(0)-catalyzed cyclopropanation and LiI-promoted vinylcyclopropane rearrangement.
image

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Bicyclo[3.2.1]oct-6-enes via (3+2)cycloaddition
Tetrahedron Letters, Volume 28, Issue 2, 1987, Pages 235-238
Brian D. Gray, Catherine M. McMillan, J. Allen Miller, Michael Moore

Graphical Abstract

Bicyclo[3.2.1]oct-6-enes are available in a one-pot, zinc chloride catalysed, (3+2+cycloaddition to alkynes
image

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Strained ring systems. III. Some oxidations of exo-bicyclo[2.2.0]Hexan-2-ol
Tetrahedron Letters, Volume 7, Issue 24, 1966, Pages 2739-2744
Richard N. MeDonald, Charles E. Reineke
37. You are entitled to access the full text of this document
Bridged ring systems—I : Synthetic approaches to clovene
Tetrahedron, Volume 16, Issues 1-4, 1961, Pages 74-79
R. D. H. Murray, W. Parker, R. A. Raphael
38. You are entitled to access the full text of this document
A synthetic approach to bicyclo[6.2.1]undecane ring systems
Tetrahedron Letters, Volume 44, Issue 13, 24 March 2003, Pages 2641-2643
Mauricio Gomes Constantino, Kleber Thiago de Oliveira, Adilson Beatriz, Gil Valdo José da Silva
A short and efficient synthesis of 10 is described.
image

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Routes to bicyclo [X.3.0] ring systems: stereoselective syntheses of image and image-8-methylhydrindans
Tetrahedron Letters, Volume 20, Issue 22, 1979, Pages 1967-1970
Peter R. Bernstein, Gilbert Stork
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Synthesis of bicyclo[6.2.2] bridgehead dienes
Tetrahedron Letters, Volume 23, Issue 5, 1982, Pages 537-538
Yoshito Tobe, Yasuyoshi Ueda, Masaharu Matsumoto, Yasuo Sakai, Yoshinobu Odaira
41. You are entitled to access the full text of this document
Bicyclic 5-5 Systems with One Bridgehead (Ring Junction) Nitrogen Atom: Four Extra Heteroatoms 3:1
Comprehensive Heterocyclic Chemistry III, 2008, Chapter 11.08, Pages 351-366
G. Hilt, W. Hess, C. Hengst
42. You are entitled to access the full text of this document
Synthesis of bicyclo[3.2.1]octanes by a tandem Diels-Alder-carbocation cyclization strategy
Tetrahedron Letters, Volume 28, Issue 42, 1987, Pages 4943-4946
James H. Rigby, Atul S. Kotnis

Graphical Abstract

Functionalized bicyclo[3.2.1]octane species are prepared in a three-step protocol.
image

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Synthesis and antifolate evaluation of the aminopterin analogue with a bicyclo[2.2.2]octane ring in place of the benzene ring
European Journal of Medicinal Chemistry, Volume 36, Issue 3, March 2001, Pages 237-242
Robert C. Reynolds, Cheryl A. Johnson, James R. Piper, Frances M. Sirotnak
44. You are entitled to access the full text of this document
Synthesis and properties of polypyrrole annelated with bicyclo[2.2.2]octene units
Tetrahedron Letters, Volume 42, Issue 4, 22 January 2001, Pages 707-710
Satoshi Ito, Hikaru Watanabe, Hidemitsu Uno, Takashi Murashima, Noboru Ono, Yu Chen Tsai, Richard G Compton
Graphic
image

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Enantioselective microbial hydroxylation of bicyclo(2.2.1)heptane carbon skeleton
Tetrahedron Letters, Volume 26, Issue 39, 1985, Pages 4775-4776
Yoshimitsu Yamazaki, Hidekatsu Maeda
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Photochemistry of bridged cycloheptadienes. Multiplicity dependent pericyclic rearrangements of excited bicyclo[4.2.1]nona-2,4-diene-7,7,8,8-tetracarbonitrile
Tetrahedron Letters, Volume 28, Issue 41, 1987, Pages 4867-4870
Zeev Goldschmidt, Elisheva Genizi

Graphical Abstract

Direct irradiation of the titled compound (V) gave (VI), whereas triplet sensitization afforded (VII).
image

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A novel synthetic approach to angularly fused tricyclopentanoids
Tetrahedron Letters, Volume 25, Issue 32, 1984, Pages 3481-3482
Goverdhan Mehta, K. Srinivas Rao
48. You are entitled to access the full text of this document
Studies on the acid-catalyzed opening of non-rigid: acylcyclopropanes: a dramatic solvent effect. A route to the bicyclo[2.2.1]heptane ring system
Tetrahedron Letters, Volume 15, Issue 6, 1974, Pages 527-530
Paul A. Grieco, Robert S. Finkelhor
49. You are entitled to access the full text of this document
Synthetic studies on (–)-FR182877: construction of the ABCD ring system via the intramolecular cycloadditions (1)
Tetrahedron Letters, Volume 48, Issue 37, 10 September 2007, Pages 6483-6487
Takahiro Suzuki, Natsumi Tanaka, Takehiko Matsumura, Yosuke Hosoya, Masahisa Nakada

Graphical abstract


image

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A concise approach towards the bicyclo[3.3.1]nonan-9-one core present in the phloroglucin natural product hyperforin
Tetrahedron Letters, Volume 49, Issue 8, 18 February 2008, Pages 1417-1420
Goverdhan Mehta, Mrinal K. Bera

Graphical abstract

.
image

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Intramolecular nickel catalyzed cycloadditions of bis-dienes: 3 approaches to the taxane skeleton
Tetrahedron Letters, Volume 28, Issue 20, 1987, Pages 2221-2224
Paul A. Wender, Marc L. Snapper

Graphical Abstract

The nickel catalyzed cycloaddition of bis-dienes is demonstrated to provide angularly alkyl-substituted bicyclo[6.4.0]dodecane and to bicyclo[5.3.1]undecanes. Models of both the AB and BC ring systems of the taxane diterpenes are described.
image

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The molecular structure of bicyclo[1.1.0]tetraarsane from ab initio calculations using analytical gradients
Journal of Molecular Structure: THEOCHEM, Volume 150, Issues 3-4, April 1987, Pages 283-287
J. Rubio, R. Pouplana, F. Illas
53. You are entitled to access the full text of this document
On the photoisomerization of bicyclo[3.2.1]octadienones
Tetrahedron Letters, Volume 12, Issue 39, 1971, Pages 3563-3566
Harold Hart, George M. Love
54. You are entitled to access the full text of this document
Intramolecular azide cycloaddition to a photochemically generated zwitterion
Tetrahedron Letters, Volume 25, Issue 10, 1984, Pages 1011-1014
Arthur G. Schultz, Sun Ok Myong, Salvador Puig
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Thermal wolff rearrangement of 3-diazo-bicyclo(3,1.0) hexan-2-one: A new route to 2-substituted bicyclo(2,1,0) pentanes.
Tetrahedron Letters, Volume 10, Issue 48, 1969, Pages 4187-4188
P. R. Brook, V. Brophy
56. You are entitled to access the full text of this document
Ring-opening–ring-closing metathesis of bicyclo[2.2.2]octenes: a novel synthesis of decalins and hydrindanes
Tetrahedron Letters, Volume 43, Issue 30, 22 July 2002, Pages 5357-5359
Timothy L Minger, Andrew J Phillips
Graphic
image

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The reactivity of complexed carbocycles : VIII. Stereospecific preparation and reactivity of metal carbonyl complexes of bicyclo[4.2.1]nonatrienone and its derivatives
Journal of Organometallic Chemistry, Volume 170, Issue 1, 24 April 1979, Pages 63-70
A. Salzer, W. von Philipsborn
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Facile access to the ABC ring system of the taxane diterpenes via anionic oxy-Cope rearrangements
Tetrahedron, Volume 51, Issue 12, 20 March 1995, Pages 3455-3482
S. F. Martin, J. -M. Assercq, R. E. Austin, A. P. Dantanarayana, J. R. Fishpaugh, C. Gluchowski, D. E. Guinn, M. Hartmann, T. Tanaka, R. Wagner, J. B. White

Graphical Abstract

Anionic oxy-Cope rearrangements of bicyclo[2.2.2]octadienols 1 provide a facile entry to substituted bicyclo[5.3.1]undecenones 2 that constitute the AB ring system of the taxane diterpenes. A functionalized derivative of 2 was elaborated into the tricyclic intermediate 3.
image

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Carbocyclic nucleoside precursors by intramolecular cyclopropanation of sugar-derived diazo compounds
Tetrahedron Letters, Volume 42, Issue 42, 15 October 2001, Pages 7489-7491
John K Gallos, Zoe S Massen, Theocharis V Koftis, Constantinos C Dellios
Graphic
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Corrigendum to “Studies towards the total synthesis of taxoids: a rapid entry into bicyclo[6.4.0]dodecane ring system. Part 2”: [Tetrahedron: Asymmetry 10 (1999) 193]
Tetrahedron: Asymmetry, Volume 16, Issue 19, 3 October 2005, Pages 3291-3293
Siméon Arseniyadis, Maria del Rosario Rico Ferreira, José Quilez del Moral, José Ignacio Martin Hernando, Nicolas Birlirakis, Pierre Potier
61. You are entitled to access the full text of this document
Studies towards the total synthesis of taxoids: a rapid entry into bicyclo[6.4.0]dodecane ring system. Part 1
Tetrahedron: Asymmetry, Volume 9, Issue 22, 27 November 1998, Pages 4055-4071
Siméon Arseniyadis, María del Rosario Rico Ferreira, José Quílez del Moral, José Ignacio Martín Hernando, Pierre Potier, Loïc Toupet
62. You are entitled to access the full text of this document
Synthetic approaches to the angucycline antibiotics: Synthesis of the C-glycosidic CD ring system
Tetrahedron Letters, Volume 35, Issue 46, 14 November 1994, Pages 8693-8696
Fleur L. Andrews, David S. Larsen

Graphical Abstract

The protected C-glycosyl substituted CD ring system (22) of the angucycline antibiotics has been prepared by the boron trifluoride promoted reaction of the sugar electrophile (16) and the naphthol (9) followed by acetylation and oxidation.
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Cyclobutylcarbinyl radical cleavage in the bicyclo[3.2.0]heptanone ring system
Tetrahedron Letters, Volume 36, Issue 3, 16 January 1995, Pages 459-460
David C. Horwell, Andrew I. Morrell, Edward Roberts

Graphical Abstract

Treatment of the bicyclic bromohydrins 1–3 with tributyltin hydride leads to the formation of the ring-opened compounds 4–6.
image

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Enantioselective synthesis of the bicyclo[4.3.0]nonane ring system of the pinguisane-type sesquiterpenoids via a Brønsted acid promoted transannular enol alkylation
Tetrahedron Letters, Volume 47, Issue 9, 27 February 2006, Pages 1453-1455
Paul A. Clarke, Richard J.G. Black, Alexander J. Blake

Graphical abstract


image

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Intramolecular nitrile oxide cycloaddition in the dihydrotropone series. A rapid entry into the bicyclo[5.3.0]decane and bicyclo[5.4.0]undecane ring systems
Tetrahedron Letters, Volume 34, Issue 19, 7 May 1993, Pages 3017-3020
James H. Rigby, Timothy W. McGuire

Graphical Abstract

Functionalized hydroazulene and bicyclo[5.4.0]undecane ring systems are constructed via an intramolecular nitrile oxide cycloaddition.
image

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A new synthesis of ring-fused alkylidenecyclobutanes by ring-enlargement reaction of bicyclo[n.1.0]alkylidene derivatives
Tetrahedron Letters, Volume 44, Issue 16, 14 April 2003, Pages 3329-3332
Morshed Alam Chowdhury, Hisanori Senboku, Masao Tokuda
Graphic
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A synthetic approach to the tricyclic system of forskolin from D-galactose
Tetrahedron Letters, Volume 35, Issue 36, 5 September 1994, Pages 6685-6688
Issam Hanna, Jean-Yves Lallemand, Philippe Wlodyka

Graphical Abstract

The synthesis of the tricyclic system of forskolin by intramolecular Diels-Alder reaction is described, starting from tri-O-acetyl-D-galactal.
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Studies on the total synthesis of fredericamycin A: Development of an intermolecular alkyne-chromium carbene complex cyclization approach to the ABCDE ring system
Tetrahedron Letters, Volume 30, Issue 16, 1989, Pages 2037-2040
Dale L. Boger, Irina C. Jacobson

Graphical Abstract

The development of a synthetic approach to the fredericamycin A ABCDE ring system based on a regiospecific intermolecular alkyne-chromium carbene complex cyclization is detailed.
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Synthesis of the new ring system 6,8-dihydro-5H-pyrrolo[3,4-h]quinazoline
Tetrahedron Letters, Volume 50, Issue 38, 23 September 2009, Pages 5389-5391
Paola Barraja, Virginia Spanò, Patrizia Diana, Anna Carbone, Girolamo Cirrincione

Graphical abstract

A series of pyrrolo[3,4-h]quinazolines, were synthesized by annelation of a pyrimidine ring to an isoindole moiety. Compound 8o showed antiproliferative activity against all the 59 tested cell lines at micromolar level.
image

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Sequential ring-opening/cyclisation reactions of bicyclo[4.2.0]oct-7-enes for the synthesis of cyclooctadiene fused lactones: Model studies towards the total synthesis of pachylactone
Tetrahedron, Volume 55, Issue 18, 30 April 1999, Pages 5889-5902
Kevin I. Booker-Milburn, F. Delgado Jiménez, Andrew Sharpe

Graphical Abstract

Bicyclo[4.2.0]oct-7-ene-1,6-dicarboxylic acid derivatives undergo a facile electrocyclic ring opening-lactonisation sequence to give fused cyclooctadiene fused lactone ring systems in excellent yield on thermolysis. Use of this reaction as the key step in an approach to the marine diterpene Pachylactone 1 is described
image

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Trifluoromethyl substituted ring systems: synthesis, and reactivity towards metal carbonyls
Journal of Fluorine Chemistry, Volume 7, Issue 6, June 1976, Pages 619-630
A. R. L. Bursics, E. Bursics-Szekeres, M. Murray, F. G. A. Stone
72. You are entitled to access the full text of this document
Synthetic approach to grayanotoxins: a new method for the construction of the a-homograyanotoxane ring system
Tetrahedron Letters, Volume 22, Issue 25, 1981, Pages 2379-2380
Tetsuji Kametani, Hiroo Matsumoto, Toshio Honda, Keiichiro Fukumoto
73. You are entitled to access the full text of this document
Biocatalytic preparation of bicyclo[3.2.0]heptane derivatives
Tetrahedron: Asymmetry, Volume 1, Issue 2, 1990, Pages 111-118
Norbert Klempier, Paul Geymayer, Peter Stadler, Kurt Faber, Herfried Giengl
74. You are entitled to access the full text of this document
Synthetic studies on bicyclomycin I synthesis of 1-allyl and benzoyl-8,10-dimethyl-6-methoxy-5-methylene-8,10-diaza-2-oxabicyclo[4.2.2]Decane-7,9-dione, which have the bicyclo ring system found in antibiotic bicyclomycin
Tetrahedron Letters, Volume 22, Issue 21, 1981, Pages 2009-2012
Shin-ichi Nakatsuka, Kumi Yoshida, Toshio Goto
75. You are entitled to access the full text of this document
Rearrangement pathways in the bicyclo[4.4.1]undecane ring system
Tetrahedron, Volume 58, Issue 24, 10 June 2002, Pages 4879-4885
James H. Rigby, Noormohamed M. Niyaz, Bérangère Bazin

Graphical Abstract


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76. You are entitled to access the full text of this document
Synthesis of bicyclo[4.3.2]undeca-2,4,8,10-tetraen-7-one. I. Anionic acceleration of a C10H10 multicenter rearrangement
Tetrahedron Letters, Volume 14, Issue 13, 1973, Pages 1085-1088
M.J. Goldstein, S.A. Kline
77. You are entitled to access the full text of this document
A novel synthetic approach to the cardiotoxin Batrachotoxin: An efficient synthesis of the AB ring system
Tetrahedron Letters, Volume 34, Issue 45, 5 November 1993, Pages 7295-7298
Peter Hudson, Garry Pairaudeau, Philip J. Parsons, Archie W. Jahans, Michael G. B. Drew

Graphical Abstract

An approach to the AB ring system of Batrachotoxin is described; the strategy is based upon a carbene mediated ring expansion.
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78. You are entitled to access the full text of this document
A formal [3+2] cycloaddition for the synthesis of bicyclo[3.2.1]octanes
Tetrahedron Letters, Volume 50, Issue 12, 25 March 2009, Pages 1261-1263
Crina M. Orac, Stephen C. Bergmeier

Graphical abstract


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79. You are entitled to access the full text of this document
Intramolecular anodic olefin coupling reactions: The construction of bridged bicyclic ring skeletons
Tetrahedron Letters, Volume 39, Issue 44, 29 October 1998, Pages 8027-8030
S.Hari Krishna Reddy, Kevin D. Moeller
The intramolecular coupling of bis enol ether substrates at an anode was examined for its ability to synthesize both bicyclo[3.2.1]octane and bicyclo[2.2.1]heptane ring skeletons.
image

80. You are entitled to access the full text of this document
An approach to the synthesis of CP-263,114: complementary routes to the bicyclic ring system via two kinds of fragmentation reaction
Tetrahedron Letters, Volume 40, Issue 28, 9 July 1999, Pages 5215-5218
Takehiko Yoshimitsu, Masahiro Yanagiya, Hiroto Nagaoka

Graphical Abstract

A new route to the ring system of CP-263,114 (1), a novel inhibitor of ras farnesyl transferase and squalene synthase, is described. Two kinds of fragmentation reaction of tricyclic compounds 12 or 17 furnished the bicyclic ring system 2.
image

81. You are entitled to access the full text of this document
Ten classes of bicyclo[p.q.0]pi-hydrocarbons, and their anions and cations. Electronic rules directly from structural formulas
Tetrahedron Letters, Volume 29, Issue 8, 1988, Pages 889-892
Oktay Sinanoglu

Graphical Abstract

While Hückel 4n+2 rule applies to monocyclics and refers to numbers of electrons, present rules deduce just from structural formulas, the numbers of nonbonding MOs, aromaticity, reactivity, without orbitals and without calculations; e.g. and electronic properties of other bicyclo[p.q.0] hydrocarbons found to fall into ten homolog classes.
image

82. You are entitled to access the full text of this document
Self-cyclization of (E)-2-(trimethylsilylmethyl)pentadienol derivative. Synthesis of bicyclo[4.3.0]nonane ring systems
Tetrahedron, Volume 62, Issue 4, 23 January 2006, Pages 726-730
Chiaki Kuroda, Masatoshi Okada, Shinya Shinozaki, Hideyuki Suzuki
Graphical Abstract
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83. You are entitled to access the full text of this document
Bifunctional reagents in organic synthesis: Stereocontrolled methods for the syntheses of functionalized trans-fused bicyclo[3.3.0]octane and bicyclo[4.3.0]nonane systems
Tetrahedron Letters, Volume 37, Issue 33, 12 August 1996, Pages 5857-5860
Edward Piers, Alan Matthew Kaller

Graphical Abstract


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84. You are entitled to access the full text of this document
On yne and allene intermediates in the bicyclo[3.2.1]octane ring system
Tetrahedron Letters, Volume 14, Issue 35, 1973, Pages 3317-3320
Peter K. Freeman, Thomas A. Hardy
85. You are entitled to access the full text of this document
Tropone and 8,8-dicyanoheptafulvene incorporated in bicyclo[2.2.1]heptane and bicyclo[2.2.2]octane ring systems
Tetrahedron Letters, Volume 19, Issue 6, 1978, Pages 569-572
Tomoo Nakazawa, Yoshihide Niimoto, Ichiro Murata
86. You are entitled to access the full text of this document
A new method for the construction of a bicyclo[3.2.1]octane ring system with a bridgehead hydroxyl group - a partial synthesis of (−)-epiallogibberic acid
Tetrahedron Letters, Volume 11, Issue 6, 1970, Pages 429-432
Kenji Mori, Masanao Matsui, Yusuke Sumiki
87. You are entitled to access the full text of this document
Synthesis of polycyclic aromatic fluoranthenes
Tetrahedron Letters, Volume 28, Issue 8, 1987, Pages 861-864
Bongsup P. Cho, Ronald G. Harvey

Graphical Abstract

A general synthetic approach to polycyclic aromatic fluoranthene hydrocarbon ring systems is described.
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88. You are entitled to access the full text of this document
Furans in synthesis 101. An efficient construction of the bicyclo[5.3.0]decane ring system of fastigilin-C
Tetrahedron Letters, Volume 31, Issue 14, 1990, Pages 1977-1980
Steven P. Tanis, Mark C. McMills, Terrence A. Scahill, David A. Kloosterman

Graphical Abstract


image

89. You are entitled to access the full text of this document
Synthetic approaches to komarovispiranes. Enantiospecific synthesis of bicyclo[3.3.0]octanespiro[3.1′]cyclohexanes
Tetrahedron Letters, Volume 48, Issue 13, 26 March 2007, Pages 2291-2294
A. Srikrishna, B. Beeraiah

Graphical abstract


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90. You are entitled to access the full text of this document
A synthetic approach to the plakoridines modeled on a biogenetic theory
Tetrahedron Letters, Volume 46, Issue 16, 18 April 2005, Pages 2803-2807
Laura L. Etchells, Ali Sardarian, Roger C. Whitehead

Graphical abstract


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91. You are entitled to access the full text of this document
A facile synthetic approach to the indeno[1,2-b]pyrrole system by cycloaddition of enamines to ninhydrin
Tetrahedron Letters, Volume 16, Issue 30, 1975, Pages 2535-2536
Nithiananda Chatterjie, Robert Shapiro, Sih-Gwan Quo, Ralph A. Stephani
92. You are entitled to access the full text of this document
Reductive decyanization of α-amino nitriles with NaBH4 a new synthetic approach to isoquinoline- and indole-alkaloids
Tetrahedron Letters, Volume 10, Issue 36, 1969, Pages 3105-3108
Shun-ichi Yamada, Hiroshi Akimoto
93. You are entitled to access the full text of this document
Synthesis of a novel prostacyclin analog containing the bicyclo[3.1.0] hexane ring system. Application of molecular mechanics calculations to organic synthesis
Tetrahedron Letters, Volume 27, Issue 37, 1986, Pages 4403-4406
S. W. Djuric', M. Miyano, J. P. Snyder

Graphical Abstract

A synthesis of Prostacyclin Analog (I) via a completelyregiocontrolled epoxide ring opening.
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A highly efficient synthesis of bicyclo[n.3.1] ring systems by allene intramolecular cycloaddition: Tandem intramolecular [2+2] cycloaddition-[3,3]-sigmatropic rearrangement
Tetrahedron Letters, Volume 27, Issue 35, 1986, Pages 4205-4208
Kenji Hayakawa, Satoru Ohsuki, Ken Kanematsu

Graphical Abstract

A Novel costruction of tricyclic[5.3.1] undecane skeleton via tandem [2+2], [3,3] reactions of allenyl ethers is described.
image

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1,4-Dioxene in organic synthesis: An approach to the A,B ring system of forskolin.
Tetrahedron Letters, Volume 33, Issue 35, 25 August 1992, Pages 5061-5064
Valérie Blanchot-Courtois, MarcelFétizon, Issam Hanna

Graphical Abstract

A methodology for the introduction of C-6 and C-7 oxygenated groups in the A,B ring system of forskolin based on the use of 1,4-dioxene is reported.
image

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Conformationally locked nucleosides. Synthesis of 3(R,S)-(adenin-9-yl)-1- and 3(R,S)-(cytosin-1-yl)-1-hydroxymethylbicyclo[2,1,1]hexanes
Tetrahedron Letters, Volume 41, Issue 37, September 2000, Pages 7139-7143
Guangyi Wang
97. You are entitled to access the full text of this document
A novel synthetic approach to medium ring lactones via dienetricarbonyliron complexes
Tetrahedron Letters, Volume 37, Issue 34, 19 August 1996, Pages 6149-6152
Ming-Liang Lai, Shun-Chi Chang, Chung-Chen Hwu, Ming-Chang P. Yeh

Graphical Abstract

Intramolecular cyclizations of carboester functionalized (η4-diene)Fe(CO)3 complexes generated eight- to ten-membered lactones depending on the length of the side chain and the reaction temperature.
image

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Efficient synthesis of the taxane C ring by fragmentation reaction of a bicyclo[2.2.2]octane derivative
Tetrahedron Letters, Volume 38, Issue 28, 14 July 1997, Pages 4997-5000
Yoshimasa Hirai, Takuya Suga, Hiroto Nagaoka

Graphical Abstract

Compounds 3 and 4 were synthesized stereoselectively from methyl (E,S)-3-(2,2-dimethyl-1,3-dioxolan-4-yl)-2-pentenoate (5) using fragmentation reaction of a bicyclo[2.2.2]octane derivative as a key step.
image

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Subject index
Tetrahedron, Volume 25, Issue 24, 1969, Pages i-xxii
100. You are entitled to access the full text of this document
A direct synthesis of hydroazulenones
Tetrahedron Letters, Volume 14, Issue 1, 1973, Pages 65-66
P. T. Lansbury, P. M. Wovkulich, P. E. Gallagher
348 Articles Related To: previous page < results 1 - 100 >
A synthetic approach to taxane diterpenes. A synthesis of the bicyclo[5.3.1]undecenone ring system
Tetrahedron Letters, Volume 27, Issue 2, 1986, Pages 203-206
Yasuo Ohtsuka, Takeshi Oishi
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