Effective uses of dirhodium(II) tetrakis[methyl 2-oxopyrrolidine-5(R or S)-carboxylate] for highly enantioselective intermolecular cyclopropenation reactions

Article abstract of DOI:10.1021/ja00098a009

The title compounds are effective catalysts for intermolecular cyclopropenation reactions of 1-alkynes with diazo esters and diazo amides. Diastereoselectivities achieved from the appropriate match with d- or l-menthyl diazoacetate are 77 to ≥ 94% de. Ena