A chiral ligand represented by the formula and its enantiomer:
wherein A, X, Y and Z are as defined in the specification is provided. Also provided is a process of making the chiral ligands and catalysts prepared from these ligands and a transition metal, a salt thereof or a complex thereof. In addition, a method of preparing an asymmetric compound by a transition metal catalyzed asymmetric reaction, such as, hydrogenation, hydride transfer reaction, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, hydrocarboxylation, allylic alkylation, epoxidation, cyclopropanation, Diels-Alder reaction, Aldol reaction, ene reaction, Heck reaction and Michael addition is provided.
提供了一种由以下公式表示的手性
配体及其对映体:其中A、X、Y和Z如规范中定义。还提供了一种制备手性
配体和由这些
配体和过渡
金属、其盐或其配合物制备的催化剂的方法。此外,还提供了一种通过过渡
金属催化的不对称反应制备不对称化合物的方法,例如氢化、
氢化物转移反应、
硅氢化反应、
硼氢化反应、
乙烯基化反应、
甲醛羧化反应、烯丙基烷基化反应、环氧化反应、
环丙烷化反应、Diels-Alder 反应、Aldol 反应、ene 反应、Heck 反应和Michael 加成。