Efficient asymmetric hydrogenation with rhodium complexes of C1-symmetric 2,5-dimethylphospholane-diphenylphosphines
作者:Sandeep Basra、Johannes G. de Vries、David J. Hyett、Gayle Harrison、Katie M. Heslop、A. Guy Orpen、Paul G. Pringle、Karl von der Luehe
DOI:10.1039/b404827j
日期:——
optically active ligands 1,2-C(6)H(4)(PPh(2))((R,R)-2,5-dimethylphospholanyl) and the new 1,1'-Fe(C(5)H(4))(2)(PPh(2))((R,R)-2,5-dimethylphospholanyl) form complexes of the type [PtCl(2)(diphos)] and [Rh(diphos)(diene)][BF(4)]. The crystal structure of reveals that only one quadrant is blocked. Asymmetric hydrogenation of acrylic esters and enamides using and as catalysts show that the phenylene-backboned
不对称的光学活性配体1,2-C(6)H(4)(PPh(2))((R,R)-2,5-二甲基磷戊基)和新的1,1'-Fe(C(5 )H(4))(2)(PPh(2))((R,R)-2,5-二甲基磷杂环戊烷基)形成[PtCl(2)(diphos)]和[Rh(diphos)(diene)类型的络合物)] [BF(4)]。的晶体结构表明只有一个象限被阻塞。使用和作为催化剂的丙烯酸酯和酰胺的不对称氢化表明,就不对称诱导而言,与更柔韧性的二茂铁骨架的二膦相比,亚苯基骨架的二膦可提供更有效的催化剂。用和酰胺底物获得的最佳结果超过用Duphos催化剂获得的最佳结果。与[Rh(Duphos)(二烯)] [BF(4)]相比,酰胺的氢化速度快10倍。