Synthesis 2019; 51(18): 3443-3450
DOI: 10.1055/s-0039-1689937
paper
© Georg Thieme Verlag Stuttgart · New York

An Improved Synthesis of Urea Derivatives from N-Acylbenzotriazole via Curtius Rearrangement

Anoop S. Singh
,
Anand K. Agrahari
,
Sumit K. Singh
,
Mangal S. Yadav
,
Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 22100, India   Email: tiwari_chem@yahoo.co.in   Email: Vinod.Tiwari@bhu.ac.in
› Author Affiliations
The authors thank the Science and Engineering Research Board (SERB), Department of Science & Technology, New Delhi (Grant No. EMR/2016/001123) for funding. The authors sincerely thank CISC-Banaras Hindu University (BHU), Varanasi for all the infrastructure and instrument support. A.K.A. and M.S.Y. acknowledge Council of Scientific & Industrial Research (CSIR), New Delhi for Senior and Junior Research Fellowships, and S.K.S. thanks University Grant Commission (UGC), New Delhi for Junior Research Fellowship.
Further Information

Publication History

Received: 09 April 2019

Accepted after revision: 14 May 2019

Publication Date:
12 June 2019 (online)


This manuscript is dedicated to (Late) Prof. Alan R Katritzky for his contribution to benzotriazole chemistry.

Abstract

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 the high-yield, mild, metal-free, one-pot reaction conditions, and short reaction time. Furthermore, in many cases, no column chromatography is required for the purification.

Supporting Information