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.
C. D. Gabbutt, J. D. Hepworth and B. M. Heron, J. Chem. Soc., Perkin Trans. 1, 1994, 653 DOI: 10.1039/P19940000653
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