Efficient Conversion of Carboxylic Acids into<i>N</i>-Acylbenzotriazoles<b />
作者:Alan R. Katritzky、Yuming Zhang、Sandeep K. Singh
DOI:10.1055/s-2003-42462
日期:——
An improved one-pot procedure for the preparation of N-acylbenzotriazoles involves mild reaction conditions and allows the preparation of several derivatives not accessible by the previously reported methods.
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.
An Improved Synthesis of Urea Derivatives from N-Acylbenzotriazole via Curtius Rearrangement
作者:Anoop S. Singh、Anand K. Agrahari、Sumit K. Singh、Mangal S. Yadav、Vinod K. Tiwari
DOI:10.1055/s-0039-1689937
日期:2019.9
Furthermore, in many cases, no column chromatography is required for the purification. The good leaving tendency of the benzotriazole moiety has been exploited for the synthesis of symmetric, unsymmetric, N-acyl, and cyclic ureas in good yields from N-acylbenzotriazoles by treating the latter with various amines in the presence of TMSN3/Et3N in a sealed tube. The salient features of the devised protocol includes
这份手稿专门献给(后期)Alan R Katritzky教授对苯并三唑化学的贡献。 抽象的 通过在TMSN 3 / Et 3 N的存在下用各种胺处理N-酰基苯并三唑,可以很好地从N-酰基苯并三唑中合成苯并三唑部分的良好留着趋势,从而以高收率合成对称,不对称,N-酰基和环状脲。在密封的管子里。所设计方案的显着特征包括高产率,温和,无金属,一锅法反应条件和较短的反应时间。此外,在许多情况下,不需要柱色谱法进行纯化。 通过在TMSN 3 / Et 3 N的存在下用各种胺处理N-酰基苯并三唑,可以很好地从N-酰基苯并三唑中合成苯并三唑部分的良好留着趋势,从而以高收率合成对称,不对称,N-酰基和环状脲。在密封的管子里。所设计方案的显着特征包括高产率,温和,无金属,一锅法反应条件和较短的反应时间。此外,在许多情况下,不需要柱色谱法进行纯化。