Synthesis of Unsymmetrical Diarylureas via Pd-Catalyzed C–N Cross-Coupling Reactions
摘要:
A facile synthesis of unsymmetrical N,N'-diarylureas is described. The utilization of the Pd-catalyzed arylation of ureas enables the synthesis of an array of diarylureas in good to excellent yields from benzylurea via a one-pot arylation-deprotection protocol, followed by a second arylation.
[EN] METHOD OF CONVERTING CARBON DIOXIDE INTO CARBONYL COMPOUNDS<br/>[FR] PROCÉDÉ DE CONVERSION DE DIOXYDE DE CARBONE EN COMPOSÉS CARBONYLE
申请人:TRANSLATIONAL HEALTH SCIENCE AND TECH INSTITUTE
公开号:WO2019073484A1
公开(公告)日:2019-04-18
The present invention provides a method for fixing carbon dioxide gas as a carbonyl compound represented by formula (3) as depicted by Figure 1 and comprising, purging of carbon dioxide in a solution of a nucleophile represented by the formula (1) in presence of a solvent at a temperature ranging from -40 Degree Celsius to 35 Degree Celsius, followed by adding a reagent at temperature ranging from -40 degree to 35 degree and thereafter adding another nucleophile represented by the formula (2) to obtain carbonyl compound represented by formula (3). The present invention can be advantageously used to obtain commercially important carbonyl compounds and clean unwanted carbon dioxide gas from the atmosphere and industrial effluents.
Broad Scope and High‐Yield Access to Unsymmetrical Acyclic [
<sup>11</sup>
C]Ureas for Biomedical Imaging from [
<sup>11</sup>
C]Carbonyl Difluoride
作者:Jimmy E. Jakobsson、Sanjay Telu、Shuiyu Lu、Susovan Jana、Victor W. Pike
DOI:10.1002/chem.202100690
日期:2021.7.16
needed for labelling acyclic ureas with carbon-11 (t1/2=20.4 min) as potential radiotracers for biomedical imaging with positronemissiontomography (PET). Herein, we describe the rapid and high-yield syntheses of unsymmetrical acyclic [11C]ureas under mild conditions (room temperature and within 7 min) using no-carrier-added [11C]carbonyl difluoride with aliphatic and aryl amines. This methodology is compatible
Tf<sub>2</sub>O‐Promoted Synthesis of Ureas, Carbamates and Thiocarbamate via Lossen Rearrangement: A Mechanistic Insight
作者:Eti Chetankumar、Chinthaginjala Srinivasulu、Ganga Periyasamy、Vommina V. Sureshbabu
DOI:10.1002/ejoc.202400028
日期:2024.4.15
A new and feasible synthetic method for ureas, carbamates and thiocarbamate from hydroxamic acid and Tf2O via Lossen rearrangement has been developed. The use of Tf2O was chemoselective with hydroxamate group with broad substrate applicability and good functional group tolerance. Further pathway of the mechanism was analysed through computational studies.