Gabbutt, Christopher D., Hepworth, John D. and Heron, B. Mark (1994) Expedient syntheses of the rotenoid and thiorotenoid systems. Journal of the Chemical Society, Perkin Transactions 1 (6). pp. 653-657. ISSN 0300-922X
Abstract

A simple four-step synthesis of a 6,6-disubstituted 6a,12a-dihydro-6H,12H-[1]benzopyrano[3,4,-b]-[1]benzopyran-12-one 6 from a chroman-4-one 3 is described. Application of the synthetic strategy to a thiochroman-4-one leads to the 5-thiorotenoid system.

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