Chiral N,N-dialkylnorephedrines supported on
polystyrene resin catalyse the enantioselective addition of dialkylzincs
to N-diphenylphosphinylimine, affording optically active
N-diphenylphosphinylamines with high enantiomeric excess. The
influence on the enantioselectivity of the carbon-chain spacer between
the chiral function and polymer resin has been examined. Reaction
temperature- and solvent-dependency on the chiral polymer-catalysed
reaction has also been examined.
负载于聚
苯乙烯树脂上的手性N,N-二烷基
去甲肾上腺素催化二烷基
锌对手性N-二苯膦
亚胺的立体选择性加成反应,生成高对映体过量率的光学活性N-二苯膦
亚胺。考察了手性功能团与聚合物
树脂之间的碳链间隔对对映选择性的影响。此外,还考察了反应温度和溶剂对这一手性聚合物催化反应的影响。