The invention provides novel non-toxic biodegradable derivatives of the formula:-
wherein Ra is (1-12C)alkyl, phenyl, naphthylmethyl or cinnamyl, the aromatic rings of which optionally bear one or two halogeno substituents, or Ra is benzyl optionally bearing up to 3 substituents independently selected from halogeno, trifluoromethyl, (l-4C)alkyl, (1-4C)alkoxy, nitro, cyano and hydroxy; Rb and Rc are independently selected from hydrogen and non-toxic biodegradable protecting radicals, but are not both hydrogen; and benzene ring A optionally bears one substituent selected from halogeno, (1-4C)alkyl, (1-4C)alkoxy, nitro and hydroxy, or bears two substituents independently selected from halogeno, (1-4C)alkyl and nitro; pharmaceutical compositions thereof; and processes for their manufacture.
The amides of formula I in which Rb=Rc=H are potent inhibitors of the enzyme aldose reductase. The derivatives of formula I provided by the invention are of use in vivo in the treatment or prophylaxis of certain complications of diabetes or galactosemia.
本发明提供了新型无毒可
生物降解衍
生物,其式如下
其中Ra是(1-12C)烷基、
苯基、
萘甲基或肉桂基,其芳香环可选择带有一个或两个卤代基,或者Ra是
苄基,可选择带有最多3个独立选自卤代基、三
氟甲基、(l-4C)烷基、(1-4C)烷
氧基、硝基、
氰基和羟基的取代基;Rb和Rc独立地选自
氢和无毒的可
生物降解的保护基,但不能都是
氢;
苯环A任选带有一个选自卤素、(1-4C)烷基、(1-4C)烷
氧基、硝基和羟基的取代基,或带有两个独立地选自卤素、(1-4C)烷基和硝基的取代基;其药物组合物;及其制造工艺。
其中 Rb=Rc=H 的式 I
酰胺是醛糖还原酶的强效
抑制剂。本发明提供的式 I 衍
生物可用于治疗或预防糖尿病或半
乳糖血症的某些并发症。