Process for the preparation of a compound of formula (III) wherein R1 is a (C1-C10)-alkyl radical or a radical of one of the known ring systems with 1-3 rings, the rings being aromatic and being isolated or partially/totally fused and having 5-6 members, being each member independently selected from C, CH, N, NH, O, S; and the ring system being optionally substituted by one or more radicals independently selected from (C1-C6)-alkyl, (C1-C6)-alkoxy, and halogen; the process comprising: a) reacting a (C1-C10)-alkyl lithium, or a lithium salt of the ring system as defined above with a copper salt to obtain an organocuprate compound, and b) reacting the organocuprate compound obtained in step a) with di(tert-butyl) (2R)-3,6-dihydro-6-oxo-1,2(2H)-pyridinedicarboxylate_in an inert solvent system in the presence of a Lewis acid. Intermediate IV is new and is useful as an intermediate for the preparation of pharmaceutically active ingredients such as Argatroban.
制备III式化合物的过程,其中R1是(C1-C10)-烷基基团或已知环系统之一的基团,环系统具有1-3个环,环是芳香的,可以是孤立的或部分/完全融合的,每个环成员独立地选择自C、CH、N、NH、O、S;并且该环系统可以选择性地被一个或多个基团取代,这些基团独立地选择自(C1-C6)-烷基、(C1-C6)-烷氧基和卤素;该过程包括:a)将(C1-C10)-烷基
锂或上述环系统的
锂盐与
铜盐反应以获得
有机铜化合物,b)在惰性溶剂体系中,在Lewis酸存在下,将步骤a)中获得的
有机铜化合物与二(叔丁基)(2R)-3,6-二氢-6-氧代-1,2(2H)-
吡啶二
羧酸酯反应。中间体IV是新的,并且可用作制备药用活性成分如阿加曲
铁的中间体。