A catalytic ammonium ylide based cyclopropanation process forms trans-disubstituted cyclopropanes in good yield upon reaction with electron-deficient alkenes (see scheme; EWG=electron-withdrawing group). The reaction is also highly enantioselective when a stoichiometric amount of a chiral tertiary amine is used.
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Papageorgiou et al. (2003) studied this question.
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