trifluoroacetic acid in methanol; chloroform T=0°C; 2.5 h;

triphenyl-phosphine oxide in acetonitrile T=20°C; 24 h;

1: (D)-serine methyl ester hydrochloride With triethylamine 2: Diethyloxytriphenylphosphorane

sodium chloride in water 24 h; Ambient temperatureCandida cylindracea lipase, potassium phosphate buffer (pH 7.5); Candida cyligracea lipase-catalysed hydrolysis of methyl aziridine-2-carboxylates and 2,3-dicarboxylates; enzymatic resolution; conversion, enantioselectivity, enantiomeric excess; Product distribution;