[EN] Pd-CATALYZED COUPLING OF PYRAZOLE AMIDES<br/>[FR] COUPLAGE DE PYRAZOLE-AMIDES CATALYSÉ PAR PD
申请人:HOFFMANN LA ROCHE
公开号:WO2014177493A1
公开(公告)日:2014-11-06
A novel process for the preparation of imidazo[1,2-a]pyridine compounds of the formula (I), wherein R1 is C1-4-alkoxy or NR4R5 wherein R4 and R5 are independently hydrogen or C1-4-alkyl or R4 and R5, together with the nitrogen atom to which they are attached, form a saturated 4- to 6-membered heterocyclic ring which may contain one further heteroatom selected from nitrogen or oxygen; R2 is C1-4-alkyl, C1-4-alkoxycarbonyl, halogen, phenyl which is optionally substituted with C1-4-alkyl, C1-4-alkoxy or halogen or is NR4R5 wherein R4 and R5 are independently hydrogen or C1-4-alkyl or R4 and R5, together with the nitrogen atom to which they are attached, form a saturated 4- to 6-membered heterocyclic ring which may contain one further heteroatom selected from nitrogen or oxygen; R3 is C1-4-alkyl and X is nitrogen or CH is described. The imidazo[1,2-a]pyridine compounds of the formula (I) are either precursors for active principles or active principles itself, acting as phosphodiesterase (PDE) inhibitors, particularly PDE10 inhibitors which have the potential to treat psychotic disorders like schizophrenia (Int. Patent Publication WO 2012/076430).
一种制备式(I)的咪唑并[1,2-a]吡啶化合物的新工艺,其中R1为C1-4-烷氧基或NR4R5,其中R4和R5独立地为氢或C1-4-烷基,或R4和R5与它们所连接的氮原子一起形成一个饱和的4-至6-成员杂环环,该环可包含一种进一步从氮或氧中选择的杂原子;R2为C1-4-烷基,C1-4-烷氧羰基,卤素,苯,可选地被C1-4-烷基,C1-4-烷氧基或卤素取代或为NR4R5,其中R4和R5独立地为氢或C1-4-烷基,或R4和R5与它们所连接的氮原子一起形成一个饱和的4-至6-成员杂环环,该环可包含一种进一步从氮或氧中选择的杂原子;R3为C1-4-烷基,X为氮或CH。式(I)的咪唑并[1,2-a]吡啶化合物是活性原料或活性原料本身,作为磷酸二酯酶(PDE)抑制剂,特别是PDE10抑制剂,具有治疗精神分裂症等精神障碍的潜力(国际专利出版物WO 2012/076430)。