Bidentate carbenoid ester coordination in ruthenium(ii) Schiff-base complexes leading to excellent levels of diastereo- and enantioselectivity in catalytic alkene cyclopropanation
作者:Ian J. Munslow、Kevin M. Gillespie、Robert J. Deeth、Peter Scott
DOI:10.1039/b104964j
日期:——
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。