A simple one-pot procedure for the preparation of 2-(het)arylquinazolin-4(3H)-ones
starting from readily available 2-nitrobenzamides and (het)aryl aldehydes is described.
Sodium dithionite is used as the reducing agent for the nitro group, and its decomposition
in situ in aqueous N,N-dimethylformamide leads to the final oxidation step that gives
the desired heterocyclic compounds.
Key words
heterocycles - oxidations - dehydrogenations - reductions - amides - aldehydes