作者:Stefania Fioravanti、Lucio Pellacani、Damiano Ricci、Paolo A Tardella
DOI:10.1016/s0957-4166(97)00239-5
日期:1997.7
The enamine derived from cyclopentanone and (2R,5R)-2,5-bis(methoxymethyl)pyrrolidine added ethyl N-mesylazidoformimidate [N3C(OEt)NMs] and ethyl azidoformate (N3CO2Et) with high asymmetric induction (>95%), while the corresponding cyclohexanone enamine gave ring contraction products. With the same azides the cyclopentanone enamine, prepared from (S)-2-(methoxymethyl)pyrrolidine gave N-substituted alpha-amino cyclopentanones in moderate enantiomeric excess. (C) 1997 Elsevier Science Ltd.