Asymmetric Induction on Copper(I) Chloride catalyzed 1,4-addition of alkylmagnesium chlorides to ?, ?-disubstituted (E)-enoylsultams and subsequent protonation
作者:Wolfgang Oppolzer、Arend J. Kingma
DOI:10.1002/hlca.19890720622
日期:1989.9.20
Successive treatment of conjugated N-enoylsultams 2 with alkyl Grignard reagents/CuCl and aq. NH4Cl solution generated selectively two stereogenic centers at C(α) and C(β) providing, after flash chromatography and crystallization, acylsultams 5 in high purity. Mild cleavage afforded the recovered sultam auxiliary 1 and enantiomerically pure carboxylic acids 7.
用烷基格氏试剂/ CuCl和水溶液连续处理缀合的N-烯丙基阿磺酰胺2。NH 4 Cl溶液有选择地在C(α)和C(β)处生成两个立体异构中心,经过快速色谱和结晶后,可以提供高纯度的酰基磺酰胺5。温和的裂解得到了回收的杜鹃花助剂1和对映体纯的羧酸7。