Birman's catalyst; 4-methoxybenzoic anhydride; N-ethyl-N,N-diisopropylamine in dichloromethane T=20°C; 12 h; optical yield given as percent eeenantioselective reaction;

Birman's catalyst; 4-methoxybenzoic anhydride; N-ethyl-N,N-diisopropylamine in dichloromethane T=20°C; 12 h; optical yield given as percent eeenantioselective reaction;