New imidazopyrdine derivatives, its preparation method and medicine composition containing same

Imidazopyridine derivatives (I) are new. Imidazopyridine derivatives of formula (I), their enantiomers, diastereoisomers, and their salts with acids and bases are new. R1 = H, halogen, alkyl, polyhaloalkyl, CN, NO2, hydroxycarbonyl, alkoxycarbonyl, aminocarbonyl, or dialkylaminocarbonyl; R2 = H, alkyl, aryl (optionally substituted), heteroaryl (optionally substituted) or a group of formula R20-C(X)-; R20 = alkyl, alkoxy, amino, alkylamino, dialkylamino, aryl (optionally substituted), or heteroaryl (optionally substituted); X = O, S, or NR21; R21, R3 = H or alkyl; n = 1-6; and N = pyrido ring with the N atom in the 1, 2, 3, or 4 positions. Alkyl and alkoxy groups have 1-6 C atoms, aryl is phenyl or naphthyl, polyhaloalkyl groups having 1-3 C atoms and 1-7 halogen atoms, heteroaryl groups may be mono or bicyclic of 5 - 11 ring atoms, at least one ring being aromatic, and having 2 or 3 heteroatoms (O, N, S) and may be substituted by 1-3 alkyl groups. Optional substituents on aryl groups may be 1 or 2 substituents selected from halogens, alkyl, alkoxy, polyhaloalkyl, hydroxy, CN, NO2, amino, alkylamino, dialkylamino, carboxyl, amido, and -COO-alkyl groups, and heteroaryl groups having a non-aromatic ring may be further substituted on this non-aromatic ring by oxo.