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Abstract
2-Mercapto-5-phenylazo-4,6-dimethylpyridine-3-carbonitrile (3) reacts with halocompounds to give S-alkylated derivatives (4a-h) which upon treatment with sod. ethoxide in ethanol, the thienopyridines (5a-h) was obtained. Compound (5) converted into pyridothienopyrimidines (6a-e) or (7a,b) boiling with triethyl orthoformate or acetic anhydride. Also it can be converted into pyridothienotriazine (8a-d) by treating with nitrous acid. Chloropyridothienopyrimidine (10a,b) was obtained by refluxing compound 6a or 7a with POCl3.
