Highly Enantioselective Cyclopropanation of Styrenes with Diazoacetates Catalyzed by Optically Active<i>β</i>-Ketoiminato Cobalt(II) Complexes
作者:Taketo Ikeno、Mitsuo Sato、Tohru Yamada
DOI:10.1246/cl.1999.1345
日期:1999.12
The highly enantioselective cyclopropanation of styrenes with diazoacetates was achieved using reasonably designed β-ketoiminato cobalt(II) complex catalysts. In the presence of optically active cobalt(II) complexes derived from optically active 1,2-(2,4,6-trimethylphenyl)-1,2-ethylenediamine, the cyclopropanation of styrene with methyl, ethyl, and tert-butyl diazoacetates proceeded to afford the corresponding
使用合理设计的 β-酮亚氨基钴 (II) 配合物催化剂实现了苯乙烯与重氮乙酸酯的高度对映选择性环丙烷化反应。在衍生自旋光 1,2-(2,4,6-三甲基苯基)-1,2-乙二胺的旋光钴 (II) 配合物存在下,苯乙烯与重氮乙酸甲酯、乙酯和叔丁酯的环丙烷化反应进行得到相应的环丙烷羧酸盐,具有 94-96% ee。