丙) Gabrial法 0 0 例1: NK++C|-CH2002597% N-CH2CO0C2H, 0 0 (1)KOH,H20 00H (2)HCI,85% COOH *H2N-CH2C00H+C2H5OH 例2: CH2(C00CH5)2=Br-CH(COOC.H)2 0 N-CH(COOC2H5)2 CH3 SCH2 CH2CI C2H5ONa N-C(C00C2 H5)2 So CH2 CH2SCH3 H20CH2SCH2CH2-C (COOH CO 2 CHrSCH2CH2-CH-COOH NH NH2 蛋氨酸(丙) Gabrial法 + Cl-CH2 COOC2 H5 C C O O N - K + 97% N C C O O -CH2 COOC2 H5 COOH COOH + H2 N-CH2 COOH + C2 H5 OH (1) KOH,H2 O (2) HCl,85% C H2 (COOC2 H5 )2 B r2 Br-CH(COOC2 H5 )2 NK O O -KBr C C O O N-CH(COOC2 H5 )2 C C O O N-C(COOC2 H5 )2 C H2 C H2 SCH3 H2 O -CO2 C H3 SCH2 C H2 -C(COOH)2 NH2 C H3 SCH2 C H2 -CH-COOH NH2 蛋氨酸 C2 H5 ONa C H3 SCH2 C H2 C l 例1: 例2: