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NYTT FOERFARANDE Foer BROMERING AV FOERENINGAR
NYTT FOERFARANDE Foer BROMERING AV FOERENINGAR
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机译:社团组织的新程序
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摘要
A process for the production of a compound of formula I IMAGE wherein R1 is carboxyl, alkoxy- (C1-5)carbonyl, amido, alkyl(C1-5)amido, di(alkyl(C1-5))amido or an amido radical of formula II IMAGE wherein Ra is alkyl(C1-4), Rb is alkyl(C1-4) or benzyl, and R2 is hydrogen or alkyl(C1-4), and either R3 is hydrogen and R4 is hydrogen or alkoxy(C1-4 or R3 and R4 together are a single bond, is characterised in that a compound of formula III IMAGE wherein R1 to R4 are as defined above, is brominated with a bromine complex of 3-bromo-6-chloro-2-methyl- imidazo[1,2-b]pyridine having the formula IV: IMAGE
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