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Report | Regular issue | Vol 19, No. 11, 1982, pp.2147-2150
Published online, 1st January, 1970
DOI: 10.3987/R-1982-11-2147
Ring Expansion of 2-Ethynylthiacycloalkanes via Sulfonium Ylides by [2,3]-Sigmatropic Rearrangement

Haruki Sashida and Takashi Tsuchiya

*School of Pharmacy, Hokuriku University, 3-Ho, Kanagawa machi, Kanazawa 920-1181, Japan

Abstract

Treatment of the α-ethynyl cyclic sulfonium salts (8) with DBU gave the corresponding ring-expansion products (11), presumably via the allenic intermediates (10) derived from the initially formed S-ylides (9) by [2,3]-sigmatropic rearrangement.