3-hydrazino-2,5-dioxopyrrolidine-3-carboxylates, process for production of the same, and use of the same
申请人:Dainippon Sumitomo Pharma Co., Ltd.
公开号:US08003808B2
公开(公告)日:2011-08-23
The present invention provides 3-hydrazino-2,5-dioxopyrrolidine-3-carboxylates of the formula (I):
wherein R1 is a C1-6 alkyl group, etc., R2 is a hydrogen atom or a COOR3 group, wherein R3 is a tert-C4-6 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 C1-4 alkyl group, a C1-4 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.
本发明提供了式(I)的3-肼基-2,5-二氧代吡咯烷-3-羧酸盐:其中R1是C1-6烷基等,R2是氢原子或COOR3基团,其中R3是叔丁基烷基、2,2,2-三氯乙基基团或苄基基团,其中苯环部分可以选择性地被一或两个原子或基团独立地选自由卤素原子、C1-4烷基、C1-4烷氧基、氰基和硝基的基团取代,以及其盐。这些化合物是制备四氢吡咯并[1,2-a]吡嗪-4-螺-3'-吡咯烷衍生物(如Ranirestat)的新型中间体,在短时间内、经济优惠和安全的方式下,有望成为治疗糖尿病并发症的有前途的治疗剂。同时本发明还提供了制备上述化合物的方法。