The metabolism of carbamazepine in humans: steric course of the enzymic hydrolysis of the 10,11-epoxide
作者:Giuseppe Bellucci、Giancarlo Berti、Cinzia Chiappe、Annalisa Lippi、Franco Marioni
DOI:10.1021/jm00388a004
日期:1987.5
having the (-)-10S,11S absolute configuration, as determined by applying the CD exciton coupling method to its bis[p-(dimethylamino)benzoyl] ester. This finding confirms the pronounced enantioselectivity of the microsomal epoxide hydrolase toward meso and racemic substrates, but is in contrast with the prevalent formation of (R,R)-diols in most other known cases of enzymatic hydrolysis of epoxides. Preparatively
卡马西平新陈代谢的关键中间体卡马西平10,11-氧化物(1a,10b-二氢-6H-二苯并[b,f]氧杂壬[d]氮杂6-羧酰胺)在孵育时对酶水解具有异常的抵抗力含有兔,大鼠和豚鼠肝脏的微粒体和胞质部分。但是,如先前报道,其水解产物反式10,11-二氢-10,11-二羟基-5H-二苯并[b,f]氮杂-5-甲酰胺以游离形式和结合形式排泄,作为卡马西平治疗后人类尿液中的主要代谢产物。通过Mosher方法发现游离二醇和用β-葡萄糖醛酸苷酶/芳基硫酸酯酶处理后得到的游离二醇均以80%的对映体形式形成,该对映体的绝对构型为(-)-10S,11S,通过将CD激子偶联方法应用于其双[对-(二甲基氨基)苯甲酰基]酯确定。该发现证实了微粒体环氧化物水解酶对内消旋和外消旋底物的显着对映选择性,但是与在环氧化物的酶水解的大多数其他已知情况下普遍形成(R,R)-二醇相反。首次报道了外消旋的反式-10,11-二氢-10