Asymmetric Synthesis of Chiral Spiroketal Bisphosphine Ligands and Their Application in Enantioselective Olefin Hydrogenation
作者:Jian Huang、Mao Hong、Chuan-Chuan Wang、Søren Kramer、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1021/acs.joc.8b01693
日期:2018.10.19
A series of chiral spiroketal bisphosphine ligands containing 1,1′-spirobi(3H,3′H)isobenzofuran backbones was accessed through asymmetricsynthesis and subsequently tested in enantioselective Rh-catalyzed hydrogenation of α-dehydroamino acid esters. The ligand providing the highest enantioselectivity (up to 99.5%) was obtained in seven steps in an overall 38% yield. The synthesis could be performed