New route to enantiomerically pure 4,4-Disubstituted cyclohex-2-en-1-ones: Asymmetric synthesis of (+)-mesembrine
作者:Hiroshi Kosugi、Yasuyuki Miura、Hiroshi Kanna、Hisashi Uda
DOI:10.1016/s0957-4166(00)80327-4
日期:1993.7
β,β-disubstituted γ-lactones which are transformed into synthetically important 44-disubstituted cyclohex-2-enones in optically pure form. The present method is applied to the synthesis of enantiomerically pure (+)-mesembrine.
对映体纯的β,β-二取代的乙烯基亚砜与二氯乙烯烯进行环加成反应,生成β,β-二取代的γ-内酯,将其转化为光学上纯净的合成上重要的44-二取代的环己-2-烯酮。本方法适用于对映体纯的(+)-半胱氨酸的合成。