Rhodium-Catalyzed Enantioselective Michael Addition of (1-Cyanoethyl)phosphonate: Synthesis of Optically Active Phosphonic Acid Derivatives with Phosphorus-Substituted Quaternary Asymmetric Carbon Center
作者:Masaya Sawamura、Hitoshi Hamashima、Yoshihiko Ito
DOI:10.1246/bcsj.73.2559
日期:2000.11
Asymmetric Michael addition of diethyl (1-cyanoethyl)phosphonate with vinyl ketones or acrylaldehyde in the presence of 0.01 molar amount of a rhodium catalyst prepared in situ from Rh(acac)(CO)2 and a trans-chelating chiral diphosphine ligand (R,R)-(S,S)-2,2′′-bis[1-(diphenylphosphino)ethyl]-1,1′′-biferrocene (PhTRAP) in benzene at 3 °C gave optically active phosphonates having a phosphorus-substituted
(1-氰乙基)膦酸二乙酯与乙烯基酮或丙烯醛在0.01摩尔量的铑催化剂存在下不对称迈克尔加成,该催化剂由Rh(acac)(CO)2和反式螯合手性二膦配体(R, R)-(S,S)-2,2''-双[1-(二苯基膦基)乙基]-1,1''-双二茂铁 (PhTRAP) 在苯中 3 °C 得到具有磷取代的光学活性膦酸酯具有高对映体过量 (92-93% ee) 且产率高的四元不对称碳中心。来自丙烯醛的迈克尔加成产物被转化为旋光(1-氨基烷基)膦酸衍生物。