2-(Diethoxyphosphoryl)- and 2-(diphenylphosphoryl)but-2-en-3-ynes, accesible from 4-mesyloxy-3-phosphorylbuta-1,2-dienes, undergo [2+3] cycloaddition with benzonitrile N-oxide or azides to afford isoxazole or 1,2,3-triazole derivatives, respectively. Click to show full abstract
2-(Diethoxyphosphoryl)- and 2-(diphenylphosphoryl)but-2-en-3-ynes, accesible from 4-mesyloxy-3-phosphorylbuta-1,2-dienes, undergo [2+3] cycloaddition with benzonitrile N-oxide or azides to afford isoxazole or 1,2,3-triazole derivatives, respectively.
               
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