Synthesis of 1,4-dihydropyridines bearing a carbamate moiety on the 4-position

A good range of 1,4-dihydropyridines bearing a carbamate moiety on the 4-position were synthesized from the primary reaction of different hydroxyaldehydes with phenyl isocyanates and the subsequent reaction of the obtained carbamates with methyl acetoacetate in the presence of ammonium fluoride. when phenyl isothiocyanate was used in place of phenyl isocyanate in the same condition,the reaction did not take place. © 2013 davood habibi et al.