<i>C</i><sub>1</sub>-Symmetric Binap Derivative Featuring Single Diferrocenylphosphino-Donor Moiety
作者:Yuuki Enomoto、Hiroki Ichiryu、Hao Hu、Yasuyuki Ura、Masamichi Ogasawara
DOI:10.1021/acs.organomet.1c00132
日期:2021.4.26
C1-symmetric chiral bisphosphine, FcPh-Binap (1), which possesses a single diferrocenylphosphino moiety together with a conventional Ph2P-substituent, was prepared in enantiomerically pure forms. Ligand 1 is sterically less demanding than Fc-Segphos (A), which has two diferrocenylphosphino groups, and showed higher activity than A in the rhodium-catalyzed asymmetric conjugate addition of phenylboronic
以对映体纯的形式制备具有单一的二铁茂铁基膦基部分和常规的Ph 2 P-取代基的C 1对称的手性双膦FcPh-Binap(1)。与具有两个二铁茂铁基膦酰基的Fc-Segphos(A)相比,配体1在空间上的需求较低,并且在铑催化的苯基硼酸向2-环己烯酮的不对称共轭加成中,配体1的活性高于A。配体1将其应用于两个钯催化的不对称反应中,即轴向手性烯丙基的合成和分子间的Heck反应,并显示出比母体Binap更高的对映选择性。在前一种反应中,Pd /(R)-1物种显示出比Pd /(R)-Binap催化剂高出47%ee增强,在后者反应中显示出39%ee增强。