Exceptionally high stereoselectivity (ee ⩽ 98%, dr ⩽
99∶1) in the cyclopropanation of alkenes with ethyl diazoacetate
using a non-planar ruthenium(II) Schiff-base precatalyst is a
result of η2C,O binding of the carbenoid ester
intermediate, according to DFT calculations.
根据DFT计算,使用非平面
钌(II) Schiff碱前
催化剂对
烯烃进行
环丙烷化时,乙基二
氮乙酸酯的立体选择性异常高(ee ⩽ 98%,dr ⩽ 99∶1),这是由于羧基
中间体的η2C,O结合所致。