3-HYDRAZINO-2,5-DIOXOPYRROLIDINE-3-CARBOXYLATES, PROCESS FOR PRODUCTION OF THE SAME, AND USE OF THE SAME
申请人:Tanaka Daisuke
公开号:US20090253917A1
公开(公告)日:2009-10-08
The present invention provides 3-hydrazino-2,5-dioxopyrrolidine-3-carboxylates of the formula (I):
wherein R
1
is a C
1-6
alkyl group, etc., R
2
is a hydrogen atom or a COOR
3
group, wherein R
3
is a tert-C
4-6
alkyl group, a 2,2,2-trichloroethyl group or a benzyl group in which the benzene ring moiety may be optionally substituted by one or two atoms or groups independently selected from the group consisting of a halogen atom, a C
1-4
alkyl group, a C
1-4
alkoxy group, a cyano group and a nitro group, and a salt thereof, which are useful as a novel intermediate for preparing tetrahydropyrrolo[1,2-a]pyrazin-4-spiro-3′-pyrrolidine derivatives such as Ranirestat being promising therapeutic agents for diabetic complications in a short process and in an economically advantageous and safe manner, and the process for preparing the same.
本发明提供了3-肼基-2,5-二氧吡咯烷-3-羧酸酯的公式(I):
其中R1是C1-6烷基等,R2是氢原子或COOR3基团,其中R3是叔C4-6烷基,2,2,2-三氯乙基或苯甲基,其中苯环部分可以任选地被一个或两个独立地选自由卤素原子、C1-4烷基、C1-4烷氧基、腈基和硝基组成的组的原子或基团所取代,以及其盐,这些盐是有用的,因为它们可以用作以经济上可行且安全的方式,以较短的工艺过程来制备四氢吡咯[1,2-a]吡嗪-4-螺-3'-吡咯烷衍生物,如Ranirestat,后者是治疗糖尿病并发症的有希望的治疗剂,以及制备该化合物的工艺。