已经开发出了使用H 2 O 2原位形成的锰配合物,可以以优异的收率(高达94%)和对映选择性(> 99%ee)对各种顺式,反式,端基和三取代的烯烃进行不对称环氧化。已经观察到配体施加的催化剂的疏水性与催化活性之间的关系。检查了酸添加剂的量和特性的影响,并且通过使用催化量的羧酸添加剂实现了改进的对映选择性。
Asymmetric Epoxidation of Alkenes Catalyzed by a Porphyrin-Inspired Manganese Complex
摘要:
A novel strategy for catalytic asymmetric epoxidation of a wide variety of olefins by a porphyrin-inspired chiral manganese complex using H2O2 as a terminal oxidant in excellent yield with up to greater than 99% ee has been successfully developed.