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A practical and environmentally friendly organocatalytic process for the synthesis of optically active highly substituted spiro5,5undecane-1,5,9-triones was achieved through the reaction of an aldehyde, an enone, and Meldrum's acid in the presence of a catalytic amount of chiral amino acid (see scheme). The Diels–Alder products were obtained as single diastereomers in excellent yields and enantiomeric excesses.
Ramachary et al. (Mon,) studied this question.