A general, highly enantioselective Michael addition of nitroalkanes to α,β-unsaturated enones catalyzed by 9-amino(9-deoxy)-epi-quinine: a remarkable additive effect
作者:Siyang Liu、Qingqing Wang、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuejun Yang、Keyi Ding、Xuefeng Li
DOI:10.1016/j.tet.2016.07.008
日期:2016.8
A particularly general protocol for the organocatalytic asymmetric Michael addition of nitroalkanes to α,β-unsaturated enones is reported. The Michaelreaction proceeded smoothly and provided the desired adducts in moderate to excellent yields (55–99%) and good to excellent enantioselectivities (65–99% ee). The addition of readily available achiral base significantly enhanced the reactivity without
Novel C2-symmetric phenylglycine derivatives as organocatalysts of the Michael reaction between nitroalkenes and ketones
作者:A. A. Kostenko、O. Yu. Kuznetsova、A. S. Kucherenko、S. G. Zlotin
DOI:10.1007/s11172-021-3163-x
日期:2021.5
2-di(2-pyridyl)-1,2-diaminoethane in the asymmetric Michaelreaction between various nitroalkenes and ketones was carried out. The products of the studied reactions were formed in up to 99% yield, with syn diastereoselectivity (dr) >20: 1 and enantiomeric excess of up to 93% ee for syn-isomer. The organocatalysts can be regenerated and reused in at least seven reaction cycles.
基于 ( R )- 和 ( S )-苯基甘氨酸和 1,2-二(2-吡啶基)-1,2-二氨基乙烷的酰胺型有机催化剂在各种硝基烯烃和进行了酮体。形成在高达99%的产率所研究的反应的产物,以顺式非对映选择性(博士)> 20:1和对映体过量高达93%的ee值为顺式异构体。有机催化剂可以在至少七个反应循环中再生和重复使用。
Modularly Designed Organocatalytic Assemblies for Direct Nitro-Michael Addition Reactions