Optimization of asymmetric hydrogenation of 3-phenyl-3-butenoic acid catalyzed by rhodium(I)-4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP)
作者:Keiji Yamamoto、Kiyoshi Ikeda、Leong Kwai Yin
DOI:10.1016/0022-328x(89)87295-x
日期:1989.7
homogeneous hydrogenation of 3-phenyl-3-butenoic acid (1) has extensively been examined in the presence of the rhodium(I)/4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP) catalyst systems. Optimization of the reaction conditions was undertaken mainly by controlling effects of added tertiary amines as well as solvent polarities on the enantio-selectivity of the product. The best asymmetric yield
在铑(I)/ 4,5-双[(二苯基膦基)甲基] -2,2-二甲基二氧戊环(DIOP)的存在下,对3-苯基-3-丁烯酸(1)的对映选择性,均相氢化进行了广泛的研究。催化剂体系。优化反应条件主要是通过控制添加的叔胺以及溶剂极性对产物对映选择性的影响来进行的。当在中性铑-DIOP催化剂中,在三乙胺(5 mol%)存在下,在75%的甲醇水溶液中进行氢化时,可获得最佳的不对称产率(85.1%ee)。