The reactive 1:1 intermediate obtained by the addition of triphenylphosphine
to dialkyl acetylenedicarboxylates was trapped by 1,2-diketone monoximes
to generate functionalized 1,2-oxazine derivatives through intramolecular Wittig
reaction without any catalyst in excellent yields.
Keywords: 1, 2-Diketone monoxime, Triphenylphosphine, Acetylenic esters, 1, 2-Oxazine, Intramolecular Wittig reaction.
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