Aerobic Enantioselective Epoxidation of Unfunctionalized Olefins Catalyzed by Optically Active Salen–Manganese (III) Complexes
作者:Tohru Yamada、Kiyomi Imagawa、Takushi Nagata、Teruaki Mukaiyama
DOI:10.1246/bcsj.67.2248
日期:1994.8
Enantioselective epoxidation of unfunctionalized olefins is achieved by the combined use of molecular oxygen and pivalaldehyde in the presence of a catalytic amount of optically active Mn(III)–salen complexes. N-Alkylimidazoles are effective axial ligands to produce optically active epoxides with high enantioselectivities in the present procedure; that is, 1,2-dihydronaphthalene derivatives and 2,
未官能化烯烃的对映选择性环氧化是通过分子氧和新戊醛在催化量的光学活性 Mn(III)-salen 配合物存在下的组合使用来实现的。N-烷基咪唑是有效的轴向配体,可在本程序中产生具有高对映选择性的旋光环氧化物;也就是说,1,2-二氢萘衍生物和2,2-二烷基-2H-色烯衍生物以60-92%的对映体过量转化为相应的光学活性环氧化物。还讨论了当前有氧环氧化的关键中间体。