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Protonation of the reactive 1:1 intermediate produced in the reaction between phosphine derivatives and dialkyl acetylenedicarboxylates with 1-nitroso-2-naphthol or 2-nitroso-1naphthol leads to a vinylphosphonium salt which undergoes intramolecular Wittig reaction to produce 1,4-oxazine derivatives without any catalyst in good yields.

New and efficient synthesis of 1,4-oxazines through the reaction of acetylenic esters and nitrosonaphthols in the presence of phosphine derivatives