Liquid phase process for the synthesis of annulated pyridines over molecular sieve catalysts

A process for the synthesis of annulated pyridines over a molecular sieve catalyst, the process comprising reacting a cyclic ketone having 5-8 carbons and an aliphatic aldehyde of the formula R1CHO wherein R1 is hydrogen or an alkyl group having 1 to 4 carbon atoms, with ammonia in an organic solvent in presence of a zeolite-type molecular sieve or heterogeneous catalyst, separating the catalyst to obtain the desired product.