N-Acylbenzotriazoles as Proficient Substrates for an Easy Access to Ureas, Acylureas, Carbamates, and Thiocarbamates via Curtius Rearrangement Using Diphenylphosphoryl Azide (DPPA) as Azide Donor
作者:Vinod K. Tiwari、Mangal S. Yadav、Sumt K. Singh、Anand K. Agrahari、Anoop S. Singh
DOI:10.1055/a-1399-3823
日期:2021.7
found to be a good alternative to trimethylsilyl azide and sodium azide for the azide donor in Curtius degradation. The high reaction yields, one-pot and metal-free conditions, straightforward nature, easy handling, use of readily available reagents, and in many cases avoidance of column chromatography are the notable features of the devised protocol.
通过在合适的叠氮化物供体二苯磷酰基叠氮化物(DPPA)存在下,使N-酰基苯并三唑分别与胺或酰胺或酚或硫醇反应,可以合成高至优等收率的各种尿素,N-酰基脲,氨基甲酸酯和硫代氨基甲酸酯。在110°C的无水甲苯中浸泡3-4小时。在此途径中,发现DPPA是库尔蒂乌斯降解中叠氮化物供体的三甲基叠氮化硅和叠氮化钠的良好替代品。高反应产率,一锅法和无金属条件,性质简单,易于处理,使用现成的试剂以及在许多情况下避免使用柱色谱法是该设计方案的显着特征。