Ja. Bacigaluppo et al., ENANTIOSELECTIVE SYNTHESIS OF THE WHITE KEY INTERMEDIATE FOR THE SYNTHESIS OF TRISPORIC ACIDS, Tetrahedron : asymmetry, 5(10), 1994, pp. 1877-1880
The asymmetric construction of the alkylated cyclohexenone carboxylic
acid moiety of trisporic acids A, B and C and the syntheses of related
precursors are described. The syntheses feature a Michael addition in
tandem with an aldol condensation as the central step.