On July 31, 2021, Yadav, Mangal S.; Singh, Sumt K.; Agrahari, Anand K.; Singh, Anoop S.; Tiwari, Vinod K. published an article.Reference of 1,3-Diphenylurea The title of the article was 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. And the article contained the following:
A diverse range of ureas RNHC(O)NHC(O)R1 [R = Ph, 2-IC6H4, 3-BrC6H4, etc.; R1 = Ph, 2-IC6H4], N-acylureas R1NHC(O)NHR2 [R1 = Ph, 3-BrC6H4, 2-MeOC6H4, etc; R2 = Ph, 2-BrC6H4, 2-IC6H4], carbamates and thiocarbamates R1NHC(O)R2 [R1 = Ph, 3,5-di-MeC6H3, 3-MeC6H4; R2 = OPh, SPh, S(2-MeC6H4), etc.] was synthesized in good to excellent yields by reacting N-acylbenzotriazoles individually with amines/amides/phenols/thiols in the presence of diphenylphosphoryl azide (DPPA) as a suitable azide donor in anhydrous toluene at 110°C for 3-4 h. In this route, DPPA was 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 chromatog. were the notable features of the devised protocol. The experimental process involved the reaction of 1,3-Diphenylurea(cas: 102-07-8).Reference of 1,3-Diphenylurea
The Article related to urea or acylurea preparation, acylbenzotriazole amine or amide curtius rearrangement dppa, carbamate or thiocarbamate preparation, phenol or thiol acylbenzotriazole curtius rearrangement dppa and other aspects.Reference of 1,3-Diphenylurea
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics