申请人:HOFFMANN-LA ROCHE INC.
公开号:US20160046628A1
公开(公告)日:2016-02-18
A novel process for the preparation of imidazo[1,2-a]pyridine compounds of the formula
wherein
R
1
is C
1-4
-alkoxy or NR
4
R
5
wherein
R
4
and R
5
are independently hydrogen or C
1-4
-alkyl or
R
4
and R
5
, 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;
R
2
is C
1-4
-alkyl, C
1-4
-alkoxycarbonyl, halogen, phenyl which is optionally substituted with C
1-4
-alkyl, C
1-4
-alkoxy or halogen or is NR
4
R
5
wherein
R
4
and R
5
are independently hydrogen or C
1-4
-alkyl or
R
4
and R
5
, 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;
R
3
is C
1-4
-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).
一种制备式为R1为C1-4-烷氧基或NR4R5,其中R4和R5分别是氢或C1-4-烷基或R4和R5连同它们所连接的氮原子形成饱和的4-至6-成员杂环环,该环可能含有一种进一步的杂原子,所选自氮或氧的咪唑并[1,2-a]吡啶化合物的新方法;其中R2为C1-4-烷基,C1-4-烷氧羰基,卤素,苯基,该苯基可以选择性地被C1-4-烷基,C1-4-烷氧基或卤素取代或是NR4R5,其中R4和R5分别是氢或C1-4-烷基或R4和R5连同它们所连接的氮原子形成饱和的4-至6-成员杂环环,该环可能含有一种进一步的杂原子,所选自氮或氧;R3为C1-4-烷基,X为氮或CH,本文描述了式I的咪唑并[1,2-a]吡啶化合物。式I的咪唑并[1,2-a]吡啶化合物是活性原料的前体或活性原料本身,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)。