Dynamic Kinetic Asymmetric Synthesis of Five Contiguous Stereogenic Centers by Sequential Organocatalytic Stetter and Michael−Aldol Reaction: Enantioselective Synthesis of Fully Substituted Cyclopentanols Bearing a Quaternary Stereocenter
作者:Bor-Cherng Hong、Nitin S. Dange、Che-Sheng Hsu、Ju-Hsiou Liao、Gene-Hsiang Lee
DOI:10.1021/ol200006e
日期:2011.3.18
A synthesis of fully substituted cyclopentanes bearing a quaternary carbon center and five contiguous stereogenic centers has been achieved by sequential organocatalyzed Stetter and Michael−Aldol reactions of heteroaromatic aldehydes, nitroalkenes, and α,β-unsaturated aldehydes via the [1 + 2 + 2] annulation strategy with dynamic kinetic asymmetric transformation and excellent enantioselectivities
通过[1 + 2 + 2]通过杂芳族醛,硝基烯烃和α,β-不饱和醛的顺序有机催化的Stetter和Michael-Aldol反应,已经实现了带有一个季碳中心和五个连续的立体中心的全取代环戊烷的合成。具有动态动力学不对称转化和出色的对映选择性(高达ee高达99%)的环空策略。