Kinetic resolution of racemic epoxides using a chiral diamine catalyst
摘要:
The kinetic resolution of a variety of racemic epoxides has been performed using a chiral bicyclic diamine ligand. Using 5 mol% of catalyst very high selectivity could be achieved; both epoxide and the corresponding allylic alcohol could be obtained in up to 99% ee. (c) 2005 Elsevier Ltd. All rights reserved.
carbodiimides in hydroxylic solvents containing hydrogenperoxide with mildly basic or acidic catalysts have been found to promote the epoxidation of olefins. A commercially available 30% aqueous solution of hydrogenperoxide serves as the oxidant for this process. The presumed reactive species is a peroxyisourea generated in situ by the addition of hydrogenperoxide to the carbodiimide.