Enantioselective Incorporation of Carbon Dioxide into Epoxides Catalyzed by Optically Active Cobalt(II) Complexes
作者:Wataru Yamada、Yasunori Kitaichi、Hirotaka Tanaka、Tomohide Kojima、Mitsuo Sato、Taketo Ikeno、Tohru Yamada
DOI:10.1246/bcsj.80.1391
日期:——
into an epoxide was developed using an optically active ketoiminatocobalt(II) complex as a chiral Lewis acid. In the presence of a catalytic amount of the cobalt complex and amine base, enantioselective CO 2 fixation with an epoxide proceeded with kinetic resolution to afford the corresponding carbonate along with unreacted epoxide, both of which were optically active. To improve their enantioselectivities
使用光学活性的酮亚氨基钴 (II) 配合物作为手性路易斯酸开发了 CO 2 对映选择性化学固定到环氧化物中。在催化量的钴络合物和胺碱的存在下,与环氧化物的对映选择性 CO 2 固定进行动力学拆分,得到相应的碳酸盐和未反应的环氧化物,两者都是光学活性的。为了提高它们的对映选择性,研究了钴配合物和胺碱的配体结构。因此,优化的催化体系成功地应用于各种环氧化物,以获得相应的光学活性环状碳酸酯,并以良好的对映选择性回收环氧化物。