Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 70, Issue 8, Pages 3292-3295Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo050009p
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Some new bisoxazoline ligands with an aryl group at the 4-position and gem-dimethyl groups at the 5-position on the oxazoline ring were prepared from arylglycines. Remarkable enhancement of the trans-selectivity (trans/cis = 87/13) and the enantioselectivity (96% ee for the trans product) was demonstrated for the asymmetric cyclopropanation of 2,5dimethyl-2,4-hexadiene with tert-butyl diazoacetate catalyzed by the new copper-bisoxazoline complex.
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