An efficient synthesis of functionalized 1,4-diazinic hemiaminals starting from methyl-4H-1,4-oxazine-3-carboxylate moiety is reported. Given that various polycyclic heterocyclic frameworks could be easily obtained, this strategy may provide an efficient method to access a library Of Compounds based on privileged Substructures that are of interest in drug discovery. (C) 2009 Elsevier Ltd. All rights reserved.