Optically active phenanthrolines in asymmetric catalysis. IV. Enantioselective hydrosilylation of acetophenone by rhodium/chiral alkyl phenanthroline catalysts.
作者:S. Gladiali、L. Pinna、G. Delogu、E. Graf、H. Brunner
DOI:10.1016/s0957-4166(00)82284-3
日期:1990.1
Thein situ catalysts prepared from [Rh(Cod)Cl]2 (Cod = 1,5-cyclooctadiene) and chiral alkylphenanthroline ligands1–6 display a remarkable activity in the asymmetric hydrosilylation of acetophenone affording, after hydrolysis, the expected 1-phenylethanol in high yield and complete selectivity. High enantioselectivities, up to 76%, were obtained in the presence of 2-substituted derivatives5 and6, whereas
在原位从的[Rh(COD)CL]制备的催化剂2(COD = 1,5-环辛二烯)和手性配体alkylphenanthroline 1-6显示在苯乙酮,得到的不对称氢化硅烷化的显着的活性,水解后,预期的1-苯基乙醇具有高收率和完全的选择性。在2-取代的衍生物5和6的存在下,对映选择性最高,可达76%,而3-烷基菲咯啉1-4的ee不高于6%。化学收率高,但对映体选择性中等(10–20%ee),潜在的齿状配体为7–10。手性烷基菲咯啉在α-甲基苄基氯化镁与乙烯基溴的不对称Ni催化的交叉偶联中是效率低下的配体。