MICROWAVE-ASSISTED SYNTHESIS OF 2-SUBSTITUTED-4H-3, 1-BENZOXAZIN- 4-ONES IN TETRAETHYLAMMONIUM CHLORIDE AS AN IONIC LIQUID Mikrowellen-unterstützte Synthese von 2-substituierten-4H-3, 1-benzoxazin- 4-ONES IN Tetraethylammoniumchlorid als ionische Flüssigkeit

A series of 2-substituted 4H-3, 1-benzoxazine-4-ones were synthesized from N-acyl anthranilic acid in the presence molten tetraethylammonium chloride as an ionic liquid under microwave irradiation. The advantages of this procedure is the employment of Mg(HSO4)2, a dehydrating agent as a catalyst instead of acetic anhydride, shorter reaction time, easy workup and high yield of the products.