[3 + 2]-Dipolar Cycloaddition Reactions of an N-Heterocyclic Carbene Boryl Azide

Thermal 1,3-dipolar cycloaddition reactions of 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene dihydridoboron azide occur smoothly with alkynes, nitriles, and alkenes bearing electron-withdrawing groups. New, stable NHC-boryl-substituted triazoles, tetrazoles, and triazolidines are formed in good to excellent yields.

1,3-双(2,6-二异丙基苯基)咪唑-2-亚基二氢硼叠氮的热诱导1,3-偶极环加成反应，可与炔烃、腈类及带有吸电子基团的烯烃顺利发生反应。该反应可得到收率良好至优异的新型稳定氮杂环卡宾（N-Heterocyclic Carbene，NHC）-硼基取代三唑、四唑及三唑烷。