Heterocyclic N-oxides. Part IV. A general route to 2-n-alkyl-3,4-dihydro-3-oxoquinoxalines and their 1-oxides
Abstract
α-Benzoyl-o-nitroacetanilide reacts with n-iodoalkanes in presence of potassium carbonate to give the corresponding C-alkylanilides. These nitro-compounds are cyclised by warm aqueous alkali to 2-n-alkyl-3,4-dihydro-3-oxoquinoxaline 1-oxides, which afford the parent quinoxalines on reduction.