The synthesis of 7-epi-pinguisone (2) from (S)-(+)-2,3,7,7a-tetrahydro-7a-methylindene-1,5(6H)-dione (4) is described. The acylation of a carbanion derived from the conjugated addition of lithium dimethylcuprate to an αβ-unsaturated ketone is re-investigated. A new synthesis of condensed β-furanones is illustrated.
S. Bernasconi, M. Ferrari, P. Gariboldi, G. Jommi, M. Sisti and R. Destro, J. Chem. Soc., Perkin Trans. 1, 1981, 1994 DOI: 10.1039/P19810001994
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