1-Propanephosphonic Acid Cyclic Anhydride (T3P) as an Efficient Promoter for the Lossen Rearrangement: Application to the Synthesis of Urea and Carbamate Derivatives
The synthesis of hydroxamic acids starting from carboxylic acids employing 1-propanephosphonic acid cyclic anhydride (T3P) activation is described. Application of ultrasonication accelerates this conversion. Further, the T3P has also been employed to activate the hydroxamates, leading to isocyanates via the Lossenrearrangement. The isocyanates were trapped with suitable nucleophiles to afford the
New and simple synthesis of acid azides, ureas and carbamates from carboxylic acids: application of peptide coupling agents EDC and HBTU
作者:Vommina V. Sureshbabu、H. S. Lalithamba、N. Narendra、H. P. Hemantha
DOI:10.1039/b920290k
日期:——
Conversion of carboxylic acids into acid azides using peptide coupling agents, EDC and HBTU is described. The procedure is efficient, practical and applicable to a diverse range of carboxylic acids including N-protected amino acids. Using the same reagents, one-pot synthesis of ureas, dipeptidyl urea esters and carbamates from acids has also been achieved.
Diarylureas and Diarylamides with Oxazolo[5,4-<i>d</i>]pyrimidine Scaffold as Angiogenesis Inhibitors
作者:Ya-Hui Deng、Ji-Ping Liu、Yi-Juan Cheng、Yu Liu、Li-Ping Sun
DOI:10.1002/cbdv.201600035
日期:2016.9
A series of oxazolopyrimidine‐based ureas and amides were designed, synthesized, and biologically evaluated for their antiproliferative and antiangiogenic activities. These compounds were identified to exhibit inhibitory activities against human umbilical vein endothelial cells (HUVEC) in vitro. Among these compounds, compound 22 effectively inhibited the migration and capillary‐like tube formation
Phenyl and Diaryl Ureas with Thiazolo[5,4‐
<i>d</i>
]pyrimidine Scaffold as Angiogenesis Inhibitors: Design, Synthesis and Biological Evaluation
作者:Wen‐Jun Xue、Ya‐Hui Deng、Zhong‐Hui Yan、Ji‐Ping Liu、Yu Liu、Li‐Ping Sun
DOI:10.1002/cbdv.201800493
日期:2019.4
receptor‐2 (VEGFR‐2) is an important factor in angiogenesis. In this work, a novel series of thiazolo[5,4‐d]pyrimidine derivatives inhibiting angiogenesis were rationally designed and synthesized. Their inhibitory activities against human umbilical vein endothelial cells (HUVEC) were investigated in vitro. 1‐(4‐Fluorophenyl)‐3‐4‐[(5‐methyl‐2‐phenyl[1,3]thiazolo[5,4‐d]pyrimidin‐7‐yl)amino]phenyl}urea (19b)
Palladium-Catalyzed Synthesis of Symmetrical and Unsymmetrical Ureas Using Chromium Hexacarbonyl as a Convenient and Safe Alternative Carbonyl Source
作者:Mozhdeh Mozaffari、Najmeh Nowrouzi
DOI:10.1002/ejoc.201901273
日期:2019.12.15
Different symmetrical and unsymmetrical ureas can be synthesized through a Pd‐catalyzed carbonylation of aryl iodides using chromium hexacarbonyl. Curtius rearrangement occurs in the presence of sodium azide which is followed by nucleophilicaddition of different amines to afford the products in good to excellent yields.