Direct Asymmetric Michael Addition of Cyclic<i>N</i>-Sulfonylimines to α,β-Unsaturated Aldehydes
作者:Xiao-Feng Xiong、Hang Zhang、Jing Peng、Ying-Chun Chen
DOI:10.1002/chem.201002592
日期:2011.2.18
Reversal of reactivity: A chemoselective direct asymmetric Michael addition of cyclic N‐sulfonylimines to α,β‐unsaturated aldehydes has been developed by employing chiral iminium catalysis. A tandem base‐catalyzed tautomerization of the imine group/hemiaminal formation/dehydroxylation process of the Michael adducts efficiently affords valuable tricyclic piperidine derivatives in moderate to excellent
反应性的逆转:通过手性亚胺鎓催化作用,已开发出化学选择性的将环状N-磺酰亚胺直接不对称Michael加成到α,β-不饱和醛上。亚胺基团的串联碱催化互变异构/迈克尔加合物的半胱氨酸形成/脱羟基过程可有效地提供有价值的三环哌啶衍生物,具有中等至出色的对映选择性。