| 摘要 |
A process for the preparation of an imidazopyridine which is a compound of formula (I) <IMG> (I) in which: Y denotes hydrogen, a halogen or a C1-4 alkyl group; X1 and X2 denote, independently of each other, hydrogen, a halogen or a C1-4 alkoxy, C1-6 alkyl, CF3, CH3S, CH3SO2 or NO2 group; and R1 and R2 denote, independently of each other, hydrogen or a C1-5 alkyl group, with the proviso that R1 and R2 do not both denote hydrogen, or a salt thereof; which process comprises reacting a compound of formula (V) <IMG> (v) wherein Y, X1, X2, R1 and R2 are as defined above, with a reducing agent and if desired converting the resulting compound of formula (I) into a salt, together with intermediates of formulae: <IMG> (III) (IV) <IMG> <IMG> (V)
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