Cage Phosphinites: Ligands for Efficient Nickel-Catalyzed Hydrocyanation of 3-Pentenenitrile
作者:Igor S. Mikhel、Michael Garland、Jonathan Hopewell、Sergio Mastroianni、Claire L. McMullin、A. Guy Orpen、Paul G. Pringle
DOI:10.1021/om101023e
日期:2011.3.14
alcohol or phenol. The cage phosphinites are remarkably stable to water. All the ligands La−h have been tested for nickel(0)-catalyzed hydrocyanation of 3-pentenenitrile in the presence of Lewis acids (ZnCl2, Ph2BOBPh2, or iBu2AlOAliBu2), and tentative structure−activity relationships are suggested. The hydrocyanation activities obtained with catalysts derived from monophosphinite Lf (with iBu2AlOAliBu2)
笼状单亚膦酸酯CgPOR(其中CgP = 6-磷酸-2,4,8-三氧杂-金刚烷,R = C 6 H 5(L a);2-C 6 H 4 CH 3(L b);2,4,6-C 6 H 2(CH 3)3(L c);2,4-C 6 H 3 t Bu 2(L d); CH 3(L e);通道2 CF 3(L f}}和二亚膦酸酯CgPZPCg 其中ZH 2 = 2,2'-双酚(L g)或1,2-苯二甲醇(L h)}由CgPBr和相应的醇或苯酚制得。笼型次膦酸盐对水非常稳定。所有配体大号A-H已经过测试,镍(0)在路易斯酸存在下3-戊烯腈的催化的氢氰化(的ZnCl 2中,Ph 2 BOBPh 2,或我卜2 AlOAl我卜2),并建议尝试性的构效关系。用衍生自单亚膦酸酯L f(具有i Bu 2 AlOAl i Bu 2)和二亚膦酸酯L h(具有ZnCl 2)的催化剂获得的氢氰化活性与基于P(OTol)3的市售催化剂相当。反式-