Organocatalytic Michael Addition of Nitro Esters to α,β-Unsaturated Aldehydes: Towards the Enantioselective Synthesis of<i>trans</i>-3-Substituted Proline Derivatives
作者:Man-Yi Han、Yong Zhang、Huai-Zhen Wang、Wan-Kai An、Bao-Chun Ma、Yuan Zhang、Wei Wang
DOI:10.1002/adsc.201200538
日期:2012.10.8
five-step strategy has been developed for the enantioselective synthesis of trans-3-substituted proline derivatives with high diasteroselectivity (dr>20:1) and enantioselectivity (up to 97% ee). The key step is the asymmetric organocatalytic Michael addition of nitro esters to α,β-unsaturated aldehydes, which affords the chiral Michael adducts in high yields (up to 96%) and excellent enantioselectivity
已经开发了一种简便的五步策略,用于对映体选择性合成具有高非对映选择性(dr > 20:1)和对映选择性(高达97%ee)的反式-3-取代脯氨酸衍生物。关键步骤是将硝基酯向α,β-不饱和醛进行不对称的有机催化迈克尔加成反应,通过使用二芳基脯氨醇甲硅烷基醚,可以以高收率(高达96%)和出色的对映选择性(高达99%ee)提供手性迈克尔加合物。作为有机催化剂。