(1,2-Diaminoethane-1,2-diyl)bis(<i>N</i>-methylpyridinium) Salts as a Prospective Platform for Designing Recyclable Prolinamide-Based Organocatalysts
作者:Vladislav G. Lisnyak、Alexander S. Kucherenko、Edward F. Valeev、Sergei G. Zlotin
DOI:10.1021/acs.joc.5b01555
日期:2015.10.2
A new efficient and highly recyclable organocatalyst has been developed for asymmetric cross-aldol reactions under neat conditions in ketone–ketone, ketone–aldehyde, and aldehyde–aldehyde systems. The catalyst features two prolinamide fragments and a C2-symmetrical (1,2-diaminoethane-1,2-diyl)bis(N-methylpyridinium) group. The catalyst retained high activity and excellent stereoselection over the operating
在酮-酮,酮-醛和醛-醛体系中,在纯净条件下开发了一种用于不对称交叉羟醛反应的新型高效且高度可回收的有机催化剂。该催化剂具有两个脯氨酰胺片段和一个C 2对称的(1,2-二氨基乙烷-1,2-二基)双(N-甲基吡啶鎓)基团。在超过830小时(25个循环)的工作时间内,该催化剂保持了高活性和出色的立体选择性。从头开始的理论研究解释了所设计的非对映异构有机催化剂的产物的绝对构型和不同的立体诱导水平。