Changsheng Jiang, Zhang Ming, Qitao Tan, Dai Qian, Tianpa You
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Asymmetric cyclopropanation catalyzed by a series of copper-(Schiff-base) complexes with two chiral centers.
A series of copper(Schiff-base) complexes with two chiral centers derived from 1,2-diphenyl-2-amino-ethanol were synthesized and applied to catalyze the asymmetric cyclopropanation of ethenes with diazoacetates. A mechanism that can explain the observed results was proposed. Some of these complexes were also efficient catalysts for asymmetric cyclopropanation of 1,1-diphenylethene with ethyl diazoacetate, affording high e.e. of up to 98.6%. An e.e. of 80.7% was achieved when no solvent was used.
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