Enantioselective Mukaiyama–Michael with 2-enoyl pyridine N-oxides catalyzed by PYBOX-DIPH-Zn(ii)-complexes at ambient temperature
作者:Subhrajit Rout、Sumit K. Ray、Vinod K. Singh
DOI:10.1039/c3ob40445e
日期:——
A chiral PYBOX-DIPH-Zn(II) catalyzed enantioselective Mukaiyama–Michael reaction of acyclic silyl enol ethers with 2-enoylpyridine N-oxides has been studied in external additive free conditions at ambient temperature. The methodology offers straightforward access to a variety of functionalized chiral 1,5-dicarbonyl compounds, which could easily be elaborated into synthetically viable pyrones via hydrolysis
在无外部添加剂条件下,研究了手性PYBOX-DIPH-Zn(II)催化无环甲硅烷基烯醇醚与2-烯丙基吡啶N-氧化物的对映选择性Mukaiyama-Michael反应。该方法提供了直接访问各种功能化的手性1,5-二羰基化合物的方法,可以通过水解然后环化将其容易地加工成合成可行的吡喃酮。已经提出了过渡状态模型来解释立体化学结果。