A straightforward synthesis of both enantiomers of allo-norcoronamic acids and allo-coronamic acids, by asymmetric Strecker reaction from alkylcyclopropanone acetals
作者:Antoine Fadel、Aballache Khesrani
DOI:10.1016/s0957-4166(97)00633-2
日期:1998.1
Methylcyclopropanone hemiacetal (2S)-3a underwent the asymmetricStrecker reaction induced by a chiral amine to provide a useful synthesis of enantiomerically pure (1R,2S)-(+)-allo-norcoronamic acid 1 in good yield and high enantiomeric excess. From racemic alkyl hemiacetal (±)-3, the same methodology also constituted a useful way to prepare both (+)-1 and (−)-1 and (+)-allo-coronamic acid 2 and its