Synthesis, Transformations of Pyrrole- and 1,2,4-Triazole-Containing Ensembles, and Generation of Pyrrole-Substituted Triazole NHC
作者:Liya D. Funt、Olesya A. Tomashenko、Alexander F. Khlebnikov、Mikhail S. Novikov、Alexander Yu. Ivanov
DOI:10.1021/acs.joc.6b02200
日期:2016.11.18
B3LYP/6-31G(d) level. The carbene forms can be easily trapped by the reaction of salts with base in the presence of sulfur. The corresponding 1- and 4-(1H-pyrrol-3-yl)-1H-1,2,4-triazole-5(4H)-thiones are formed in high yields. In the absence of sulfur as a trap, the opening of the triazole ring occurs with the formation of derivatives of N-cyanoformimidamide. According to the DFT calculations the latter is most
前所未有的含吡咯和1,2,4-三唑的团簇,取代的1-(1 H-吡咯-3-基)-4 H -1,2,4-三唑-1-溴化物和4-(1 H -H-吡咯-3-基)-1 H -1,2,4-三唑-4-溴化铵,是使用简单的方法由2 H-叠氮基和三唑鎓苯甲酰溴制备的。ñ - (1 ħ吡咯-3-基) - ñ '-benzyltriazolium溴化物经受脱苄基化还原在Pd / C,得到取代的1-(1- ħ吡咯-3-基)-4- ħ -1,2,4-三唑和4-(1 H-吡咯-3-基)-1 H-1,2,4-三唑的收率高。根据DFT B3LYP / 6-31G(d)水平的计算,甜菜碱(三唑基吡咯烷酮)和吡咯基三唑NHCs是吡咯基三唑盐盐的溴化氢溴化产物,在非极性溶剂中具有相当的热力学稳定性。卡宾形式可以容易地通过盐与碱在硫的存在下反应而被捕集。以高收率形成相应的1-和4-(1 H-吡咯-3-基)-1 H -1,2,4-三唑-5(4