New expanded bisphosphane ligands with a chiral trans-1,2-substituted cyclopentane skeleton were prepared. Polyaldehydes were accessible by coupling optically active bisphosphane precursors with branched aryl bromides. Optically active expanded ligands were obtained by condensation of the aldehydes with chiral amines and amino alcohols. The optically active ligands were tested in several model reactions of enantioselective catalysis, including allylic alkylation, hydrogenation (adopted to the use of water), and hydrosilylation.
新扩展的双
膦配体具有手性反式-1,2-取代
环戊烷结构被制备出来。通过将光学活性的
双膦前体与支链芳基
溴化物偶联,可以获得多醛。通过将醛与手性胺和
氨基醇缩合,获得了光学活性扩展
配体。光学活性
配体在多个手性选择性催化的模型反应中进行了测试,包括烯丙基烷基化、氢化(适用于
水的使用)和氢
硅化。