Bromo-Directed <i>N</i>-2 Alkylation of <i>NH</i>-1,2,3-Triazoles: Efficient Synthesis of Poly-Substituted 1,2,3-Triazoles
作者:Xiao-jun Wang、Kanwar Sidhu、Li Zhang、Scot Campbell、Nizar Haddad、Diana C. Reeves、Dhileepkumar Krishnamurthy、Chris H. Senanayake
DOI:10.1021/ol902334x
日期:2009.12.3
4-bromo-NH-1,2,3-triazoles 2 with alkyl halides in the presence of K2CO3 in DMF produced the corresponding 2-substituted 4-bromo-1,2,3-triazoles 5 in a regioselective process. Subsequent Suzuki cross-coupling reaction of these bromides provided an efficient synthesis of 2,4,5-trisubstituted triazoles 3. In addition, reduction of the bromotriazoles by hydrogenation furnished an efficient synthesis of
在DMF中K 2 CO 3存在下,4-溴-NH -1,2,3-三唑2与烷基卤的反应在区域选择性中产生了相应的2-取代的4-溴-1,2,3-三唑5过程。这些溴化物的随后的Suzuki交叉偶联反应提供了2,4,5-三取代的三唑3的有效合成。另外,通过氢化还原溴代三唑提供了2,4-二取代的三唑8的有效合成。