Enantioselective Acylation Using a Second-Generation <i>P</i>-Aryl-2-phosphabicyclo[3.3.0]octane Catalyst
作者:James A. MacKay、Edwin Vedejs
DOI:10.1021/jo049112p
日期:2004.10.1
The synthesis of P-aryl-2-phosphabicylco[3.3.0]octane·HBF4 salts 3a and 3c is described. Incorporation of the P-3,5-di-tert-butyl-4-methoxyphenyl group in 3c allows use of a less expensive aryl bromide starting material. Deprotonation of the air-stable salts in situ with triethylamine releases the corresponding phosphines 1a and 1c for use in the kinetic resolution of representative secondary alcohols