Asymmetric synthesis of 2-alkyl-substituted tetrahydroquinolines by an enantioselective aza-Michael reaction
作者:Laura L. Taylor、Frederick W. Goldberg、King Kuok (Mimi) Hii
DOI:10.1039/c2ob25122a
日期:——
An optically active tetrahydroquinoline intermediate (5) was prepared in 8 steps from monoprotected ethylene glycol, using a Pd-catalysed aza-Michael reaction to induce chirality. This can be transformed into three Galipea alkaloids (angustureine, galipeine and cuspareine). The proximity of a benzyloxy group is found to exert profound effects in several steps of the synthesis.
一种光学活性的四氢喹啉中间体(5)经过8个步骤由单保护的乙二醇制备而成,使用钯催化的氮-迈克尔反应来引入手性。该中间体可以转化为三种Galipea生物碱(角度线碱、加利碱和库斯帕碱)。邻近的苄氧基团在合成的多个步骤中被发现对反应有显著影响。