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)- pyridinedicarboxylatejn 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.
制备式(III)化合物的过程,其中R1是(C1-C10)烷基或已知环系之一的基团,该环系具有1-3个环,环为芳香环且为隔离或部分/完全融合,其中每个环成员独立地选择自C,CH,N,NH,O,S,环系可由一个或多个基团独立地选择自(C1-C6)烷基,(C1-C6)烷
氧基和卤素进行取代;该过程包括:a)反应(C1-C10)烷基
锂或上述定义的环系的
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
路易斯酸的存在下,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
甲酸酯反应。
中间体IV是新的,可用作制备药物活性成分,如
阿加曲班的
中间体。