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doi:10.1016/S0040-4039(00)83980-5    
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Copyright © 1986 Published by Elsevier Science Ltd. All rights reserved.

A novel homolytic substitution on vinylic carbon. A new route to vinyl stannane

Yoshihiko Watanabe, *, Yoshio Ueno, Takumi Araki, Takeshi Endo and Makoto Okawara

Research Labolatory of Resources Utilization, Tokyo institute of Technology, Nagatsuta, Midoriku, Yokohama 227 Japan


Received 14 November 1985. 
Available online 8 March 2001.

Abstract

(Alkylsulfonyl) benzothiazole 1 reacted with tributyltin hydride in the presence of azobisisobutyronitrile at 80°C to give 2-(tributylstannyl) benzothiazole in 67–79% yield. Similarly, vinylsulfone Image gave the corresponding vinylstannane in 58–78% yield.

References

D. Seyferth, Editor, New Applications of Organometallic Reagents in Organic Synthesis, Elsevier, Amsterdam (1976).
E. Negishi Organometallics in Organic Synthesis 1, John Wilkey, New York (1980).

R.C. Poller In: The Chemistry of Organotin Compounds, Logos Press, London (1970), pp. 105–130.

A.J. Bilch and I.D. Jenskins In: H. Alper, Editor, Transition Metal Organometallics in OrganiSynthesis 1, Academic Press, New York (1976), pp. 1–82.

G.A. Russel and F. Ros J. Am. Chem. Soc. 104 (1982), p. 7349.
N. Kornbulm Angew. Chem. 14 (1975), p. 734 Int. Ed. .
J. Dupuis, B. Giese, J. Hartung and M. Leising J. Am. Chem. Soc. 107 (1985), p. 4332. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (19)

In all cases, a small amount of benzothiazole was isolated in 5–10% yield. All new compounds showed satisfactory physical and spectral data.

The eliminated sulfonyl radical (·SO2CH2COCH3) may cleave to sulfur dioxide and acetonyl radical prior to the formation of stannylsulfinate (Bu3SnOSOCH2COCH3). Acetonyl radical may give eventually acetone.

The stereochemistry of Image was estimated by 1H NMR. The trans isomer (98%) was formed predominantly A.J. Leusick, H.A. Budding and J.W. Marsman J. Organometal. Chem. 9 (1967), p. 285.

D. Milstein and J.K. Stille J. Am. Chem. Soc. 101 (1979), p. 4981. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (46)
D. Milstein and J.K. Stille J. Am. Chem. Soc. 101 (1979), p. 4992. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (128)

E.J. Corey and R.H. Wollenberg J. Am. Chem. Soc. 96 (1974), p. 5581. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (46)

W.P. Neumann and E. Heymann Ann. Chem. 683 (1965), p. 24. Full Text via CrossRef

M. Fiorentino, L. Testaferri, M. Tiecco and L. Troisi J. Chem. Soc. 316 (1977) Chem. Comm. .

M.Julia etal. reported the tributyltin hydride catalyzed cis-trans isomerization of vinylsulfone, although they can not obtain substituted products described here. M. Julia, C. Rolando and J.N. Verpeaux Tetrahedron Lett. 23 (1982), p. 4319 Their postulation (addition and elimination of tin radical, eq 1) seems to be unlikely, since we have already confirmed the exclusive splitting of sulfonyl radical but not tin one in a closely related system (eq 2). . Abstract | PDF (117 K) | View Record in Scopus | Cited By in Scopus (1)
Y. Ueno, S. Aoki and M. Okawara J. Am. Chem. Soc. 101 (1979), p. 5414 Julia's result can be explainedby the partial electron transfer leading to the intermediate similar to the anion-radical tin-cation complex. . Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (17)


Tetrahedron Letters
Volume 27, Issue 2, 1986, Pages 215-218
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