Copyright © 1986 Published by Elsevier Science Ltd. All rights reserved.
Patrick G. McDougal and Young-Im Oh
Department of Chemistry, Georgia Institute of Technology, Atlanta, GA 30332 U.S.A.
Received 7 August 1985.
Abstract
A two-step procedure for the elaboration of aldehydes to 2-substituted 3-thiofurans has been developed. The key step involves a site-selective deprotonation of a substituted vinyl sulfide.
References
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M.V. Sargent and P.M. Dean In: A.R. Katritsky and C.W. Rees, Editors, Comprehensive Heterocyclic Chemistry 4, Pergamon Press, Oxford (1984), p. 601.
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For another base catylyzed elimination of an α-chloro sulfide that is less stereoselective P. Bakuzis and M.L.F. Bakuzis J. Org. Chem. 46 (1981), p. 235 see . Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (53)
The vinyl sulfide 1 is best stored at 0° as a neat oil.
O. Ruel, Bi Ekogka C. Bibang and S.A. Julia Tetrahedron Lett. 24 (1983), p. 4829. Abstract |
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Z-Vinyl sulfides can undergo vinyl deprotonation Bi Ekogka C. Bibang, O. Ruel and S.A. Julia Tetrahedron Lett. 24 (1983), p. 4825 see .
A γ-amino group, one of the better chelating groups, does direct deprotonation α to the sulfur in vinyl sulfides J.J. Fitt and H.W. Gschwend J. Org. Chem. 44 (1979), p. 303 see . Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (10)
A typical experiment is as follows: To the vinyl sulfide 1 (800 mg, 3.85 mmoL) in DME (8 ml) at −78° was added s-BuLi(4.4 ml of a 1.3 M solution in cyclohexane, 5.7 mmoL). After warming to −40° for 15 min the reaction was recooled to −78° and dihydrocinnamaldehyde (773 mg, 5.7 mmol) was added neat. Upon warming to 0° the reaction was diluted with hexane-ether (9:1, 100 ml), washed with aqueous K2CO3(2 x 50 ml), dried (MgSO4) and concentrated. The resulting yellow oil was dissolved in methanol (14 ml) and stirred in the presence of d-camphorsul tonic acid (40 mg) for 16 hr at room temperature (other examples have shown that 3 hr is sufficient to complete the reaction). Dilution with hexane (100 ml) followed by washing with 10% aqueous K2CO3(2 x 40 ml), drying (MgSO4)and concentrating gave a yellow oil. This residue was purified by flash chromatography (2 x 15 cm) using ethyl acetate hexane (2:98) as the eluent to yield 6b (740 mg, 69%) as a colorless oil.
All new compounds have been fully characterized by IR, 1H NMR and mass spectroscopy.
The cycloaddition of vinyl heterocycles is of considerable current interest W.E. Noland, C.K. Lee, S.K. Bae, B.Y. Chung, C.S. Hahn and K.J. Kim J. Org. Chem. 48 (1983), p. 2488 see . Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (7)
K. Hayakawa, Y. Mitsuaki, S. Ohsuki and K. Kanematsu J. Am. Chem. Soc. 106 (1984), p. 6735. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (33)
A. Murai, K. Takahaski, H. Taketsuru and T. Masamune Chem. Comm. (1981), p. 221. Full Text via CrossRef
P.X. Iten, A.A. Hofmann and C.H. Eugster Helv. Chim. Acta. 62 (1979), p. 2202. Full Text via CrossRef






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−60°C) to undergo highly chemoselective addition to a structurally diverse group of aldehydes in fair to excellent yields. However, stereoselectivity obtained upon attempted chelation controlled addition to α and β-alkoxy aldehydes is modest.


