5.与氯代甲酸叔丁酯反应 0 NH, (CH3)3C—0—C- CI HOOC—C—R H (CH33C—0—C-NHCH-COOH R CH33C-0-C0- Boc5. 与氯代甲酸叔丁酯反应 ＋ O C Cl O CH COOH R O C NH O C H HOOC R NH2 (CH3)3C (CH3)3C (CH3)3C－O－CO－： Boc