Theoretical (DFT) Insights into the Mechanism of Copper-Catalyzed Cyclopropanation Reactions. Implications for Enantioselective Catalysis
- 13 July 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 123 (31) , 7616-7625
- https://doi.org/10.1021/ja003695c
Abstract
The mechanism of the copper(I)-catalyzed cyclopropanation reaction has been extensively investigated for a medium-size reaction model by means of B3LYP/6-31G(d) calculations. The starting ethylene complex of the N,N‘-dimethylmalonaldiimine−copper (I) catalyst undergoes a ligand exchange with methyl diazoacetate to yield a reaction intermediate, which subsequently undergoes nitrogen extrusion to generate a copper−carbene complex. The cyclopropanation step takes place through a direct carbene insertion of the metal−carbene species to yield a catalyst−product complex, which can finally regenerate the starting complex. The stereochemical predictions of a more realistic model (by considering a chiral bis(oxazoline)−copper (I) catalyst) have been rationalized in terms of steric repulsions, showing good agreement with experimental data.This publication has 48 references indexed in Scilit:
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