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Communication | Regular issue | Vol 6, No. 11, 1977, pp.1877-1880
Published online, 1st January, 1970
DOI: 10.3987/R-1977-11-1877
A Novel Ring Contraction of 4-Bromo-2,3-dihydrobenzo[b]thiepin-5(4H)-one

Mitsuhito Okitsu, Hiroshi Shimizu, Tadashi Kataoka, and Mikio Hori*

*Department of Pharmacognosy, Gifu College of Pharmacy, 6-1 Mitahora-higashi 5-chome, Gifu 502-8585, Japan

Abstract

The unexpected ring contraction of 4-bromo-2,3-dihydrobenzo[b]thiepin-5(4H)-one (I) to 3-oxo-2,3-dihydro[l]benzothiophen-2-spirocyclopropane (II) besides 2,3-dihydro[l]benzothieno[3,2-b]furan (III) is reported.