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Asymmetric cyclopropanation catalyzed by C2-symmetric bis-(ephedrine)-Cu(II) complexes

✍ Scribed by Jian Gao; Shun He Zhong

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 77 KB
Volume: 191
Category: Article
ISSN: 1381-1169
DOI: 10.1016/s1381-1169(02)00326-6

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✦ Synopsis

The asymmetric cyclopropanation of styrene with alkyl diazoacetate was performed with a series of Cu(II) complexes of novel chiral ligands, which were derived from substitution of 1,3-dibromopropane, 1,2-dibromoethane, ␣,␣ -dibromo-m-xylene and 2,6-bis(bromomethyl)pyridine with 1R, 2S-(-)-ephedrine. These prepared catalysts shown to be highly active in the enantioselective cyclopropanation with ee higher than 89% under the optimal conditions.

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