Gabriel法 0 R—CHC0oC CH-COOCH B R COOH 水解 R--CH-COOH + CH2Oh NH COOH三、Gabriel法 R COOCH CH 3 Br 水解 N K O O N CH COOCH3 O O R COOH COOH ＋ R COOH CH NH2 ＋ CH3OH