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 asymmetric Strecker 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
Methylcyclopropanone半缩醛(2小号) - 3a中经历由手性胺诱导的不对称的Strecker反应,以提供对映体纯的有用合成(1 - [R,2小号) - (+) -异基因-norcoronamic酸1以良好的收率和高对映体过量。从外消旋烷基半缩醛(±) - 3,同样的方法也构成以制备两者(+)的有用方法- 1和( - ) - 1和(+) -异基因-coronamic酸2和与其对映体( - ) - 2具有良好的收率和高的对映体过量。