Ionic liquid-mediated synthesis of (1H-1,2,3-triazol-1-yl)furoxans by [3 + 2] cycloaddition of azidofuroxans to acetylenes

The [3 + 2] cycloaddition of azidofuroxans to internal and terminal acetylenes was found to occur only in ionic liquids on heating and afford (1H-1,2,3-triazol-1-yl)furoxans in moderate to good yields. The reaction with terminal acetylenes proceeds with high regio- selectivity.