Structure and activity relationships of novel uracil derivatives as topical anti-inflammatory agents
摘要:
In order to create novel, topical anti-inflammatory compounds exhibiting more potent activities than lead compound CX-659S (1), we designed and synthesized various derivatives of 1 focusing on the uracil N(l)- and N(3)-substituents, and evaluated their anti-inflammatory activities via inhibition of the picryl chloride-induced contact hypersensitivity reaction (CHR) in mice. In the course of our structure and activity relationship study, we found that compounds 6k, 6q, and 6r inhibited by approximately 50% the CHR, at 0.1 mg/ear. These activities were essentially equipotent with that of Tacrolimus, a strong immunosuppressant. (C) 2003 Elsevier Ltd. All rights reserved.
gold‐catalyzed nitrogenation of alkynes for the synthesis of carbamides and amino tetrazoles through CC and CCbondcleavages is described. A diverse set of functionalized carbamide and amino tetrazole derivatives were selectively constructed under mild conditions. The chemoselectivity can be easily switched by the selection of the acid additives. The reaction is characterized by its broad substrate scope
On the Thermal Dissociation of Organic Compounds. XII. The Effects of the Substituents on the Thermal Dissociation of Substituted Phenylureas
作者:Shoichiro Ozaki、Tsutomu Nagoya
DOI:10.1246/bcsj.30.444
日期:1957.5
synthesized. The rate constants and ρ values of thermaldissociation of these ureas in fattyacids were determined. In 1,1-diethyl-3-arylureas, the ρ value of the dissociation reaction at 95°C. in chloro-acetic acid was −0.196, and it may be concluded that the protonation process seems to be the rate-determining step in the dissociation reaction of ureas in fattyacid. The activation energy was compared with
An efficient method for the Lossen rearrangement that uses 2,4,6-trichloro-1,3,5-triazine (TCT) as a promoter is reported. This procedure allowed the preparation of various carbamates, thiocarbamates, and ureas in good yields directly from the corresponding hydroxamic acids.
Abstract A new practical method for the synthesis of unsymmetrical ureas was achieved by reaction of phenylurea with primary and secondary amines under neutral and mild condition in very good yields. The reaction took place in refluxing dioxane and does not require any catalyst or additives.