Synthesis of New Atropisomeric Bisphosphine Ligands Bearing Chiral Phospholane and Their Use in Asymmetric Hydrogenation.
作者:Naoto FUJIE、Mariko MATSUI、Kazuo ACHIWA
DOI:10.1248/cpb.47.436
日期:——
Novel chiral bisphosphine ligands bearing (2S, 5S)-dimethylphospholano group on a chiral biphenyl back-bone were designed and prepared. Asymmetric hydrogenations of a ketone and an olefin with the rhodium(I) complex catalysts prepared in situ from [Rh(COD)Cl]2 and (R)-2, 2'-bis[(2"S, 5"S)-2", 5"-dimethylphospholano]-5, 5'-dimethoxy-4, 4', 6, 6'-tetramethyl-1, 1'-biphenyl and (S)-2, 2'-bis[(2"S, 5S")-2", 5"-dimethylphospholano]-5, 5'-dimethoxy-4, 4', 6, 6'-tetramethyl-1, 1'-biphenyl gave the corresponding alcohol and alkane in high yields. The asymmetric hydrogenations with these ligands showed a different enantioselectivity.
设计并制备了在手性联苯背骨架上带有 (2S, 5S) 二甲基膦基的新型手性双膦配体。在铑(I)络合物催化剂的作用下,用[Rh(COD)Cl]2 和(R)-2, 2'-双[(2 "S, 5 "S)-2", 5"-二甲基磷酰]-5, 5'-二甲氧基-4, 4'、6,6'-四甲基-1,1'-联苯和 (S)-2,2'-双[(2 "S,5S")-2",5"-二甲基磷杂环戊烷]-5,5'-二甲氧基-4,4',6,6'-四甲基-1,1'-联苯高产率地得到了相应的醇和烷。这些配体的不对称氢化反应显示出不同的对映选择性。