Highly Regioselective <i>N</i>-2 Arylation of 4,5-Dibromo-1,2,3-triazole: Efficient Synthesis of 2-Aryltriazoles
作者:Xiao-jun Wang、Li Zhang、Heewon Lee、Nizar Haddad、Dhileepkumar Krishnamurthy、Chris H. Senanayake
DOI:10.1021/ol9019875
日期:2009.11.5
Reaction of 4,5-dibromo-1,2,3-triazole with electron-deficient aromatic halides in the presence of potassium carbonate in DMF produces the corresponding 2-aryl-4,5-dibromotriazoles with high regioselectivity. Subsequent debromination of these triazoles by hydrogenation furnishes 2-aryltriazoles in excellent yields. Overall, this two-step process provides an efficient access to 2-aryl-1,2,3-triazoles.