chiral C2-symmetric bis(β-hydroxy amide) ligands was synthesized via the reaction of isophthaloyl dichloride and amino alcohols derived from l-amino acid. The titanium(IV) complex of C2-symmetric chiral ligand 3b was effective for the asymmetric alkynylation of aldehydes and the propargyl alcohols were obtained in high yields (up to 94%) and high enantiomeric excesses (up to 98%) under optimized conditions
通过间苯二甲酰二
氯与衍生自1-
氨基酸的
氨基醇反应,合成了一系列手性C 2对称的双(β-羟基酰胺)
配体。C 2对称手性
配体3b的
钛(IV)络合物可有效地实现
醛类的不对称炔化,在优化条件下可以高产率(最高94%)和高对映体过量(最高98%)获得炔
丙醇。 。使用
配体3h获得的结果支持这些
配体中的两个β-羟基酰胺部分在催化体系中表现为两个独立的
配体。