Organocatalytic Asymmetric Vinylogous Michael Addition of Dicyanoolefins to Imine Intermediates Generated<i>in situ</i>from Arenesulfonylalkylindoles
作者:Xing-Li Zhu、Wu-Jun He、Liang-Liang Yu、Chang-Wu Cai、Zong-Le Zuo、Da-Bin Qin、Quan-Zhong Liu、Lin-Hai Jing
DOI:10.1002/adsc.201200286
日期:2012.11.12
An organocatalytic asymmetric vinylogous Michael addition of dicyanoolefins to vinylogous imine intermediates generated in situ from arenesulfonylalkylindoles has been developed. This protocol provides an easy and convenient approach to C-3 alkyl-substituted indole derivatives with high yields (up to 93%), diastereomeric ratios (up to 99:1 dr) and enantioselectivities (up to 99% ee). The resulting
已经开发了将二氰基烯烃的有机催化不对称乙烯基类迈克尔迈克尔加成到由芳烃磺酰基烷基吲哚就地产生的乙烯基类亚胺中间体上。该方案为C-3烷基取代的吲哚衍生物的高收率(高达93%),非对映异构体比率(高达99:1 dr)和对映选择性(高达99%ee)提供了一种简便方法。所得的加合物也可以容易地转化为吡唑并衍生物或酮的α-烷基化产物,而非对映选择性和对映选择性不降低。