Enaminonitrile in heterocyclic synthesis: synthesis of thiazolo [4,5-b] pyridine and thiazolo [4,5-d] pyrimidine derivatives

Ammoniumn- phenyldithiocarbamate reacted with bromomalononitrile and alpha chloroacetylacetone to afford thiazole derivatives 3a, b. Compound 3a reacted with benzylidenemalononitrile, malononitrile, phenylisothiocyanate, benzoylisothiocyanate, trichloroacetonitrile, formamide, carbon disulphide and triethylorthoformate to afford thiazolo [4,5-b] pyridine derivatives 6,9 and thiazolo [4,5-d] pyrimidine derivatives 13, 16, 18, 19, 20 and 21. Most of the synthesized products show high fungicidal and bactericidal activities