Abstract
Isopropylidenetriphenylphosphorane reacts with γ-alkoxy α,β-unsaturated esters and produces γ-alkoxy cyclopropane carboxylates. The stereochemistry of the carbon-carbon double bond in the ester has a great influence on the stereo-chemistry of the resulting cyclopropane derivative. This reaction has been successfully used for the synthesis of chrysanthemic acid from diester 2a derived from natural tartaric acid.
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