… of heterocycles by sigmatropic rearrangement: passage to 3, 11a-dimethyl-6a, 11a-dihydro-1H, 6H-pyrano [3′, 4′: 5, 6] thiopyrano [4, 3-b][1] benzofuran-1-one

KC Majumdar, UK Kundu, S Ghosh

Index: Majumdar, Krishna C.; Kundu, Uday K.; Ghosh, Subhojit Journal of the Chemical Society. Perkin Transactions 1, 2002 , # 19 p. 2139 - 2140

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Citation Number: 4

Abstract

View Article Online/Journal Homepage/Table of Contents for this issue intermediate 12. Intermediate 12 may tautomerize to 13 which, on '5-exo'ring closure, should give compound 11. Substrates 5a, b, c underwent [3, 3] sigmatropic rearrangement at the vinyl propargyl sulfide segment instead of the aryl propargyl ether moiety. A lesser energy requirement for the sigmatropic rearrangement in vinyl propargyl systems10 compared to that in aryl ...