Metal-Free Synthesis of Unsymmetrical Ureas and Carbamates from CO<sub>2</sub> and Amines via Isocyanate Intermediates
作者:Yiming Ren、Sophie A. L. Rousseaux
DOI:10.1021/acs.joc.7b02905
日期:2018.1.19
A mild and metal-free synthesis of aryl isocyanates from arylamines under an atmosphere of CO2 was developed. The carbamic acid intermediate, derived from the arylamine starting material and CO2 in the presence of DBU, is dehydrated by activated sulfonium reagents to generate the corresponding isocyanate. The latter can be detected by in situ IR and trapped by various amines and alcohols to make unsymmetrical
Lanthanum(III) Trifluoromethanesulfonate Catalyzed Direct Synthesis of Ureas from N-Benzyloxycarbonyl-, N-Allyloxycarbonyl-, and N-2,2,2-Trichloroethoxycarbonyl-Protected Amines
作者:Hee-Kwon Kim、Tien Tan Bui
DOI:10.1055/s-0040-1707991
日期:2020.6
A novel lanthanum triflate mediated conversion of N-benzyloxycarbonyl-, N-allyloxycarbonyl-, and N-trichloroethoxycarbonyl-protected amines into nonsymmetric ureas was discovered. In this study, lanthanum triflate was found to be an effective catalyst for preparing various nonsymmetric ureas from protected amines. A variety of protected aromatic and aliphatic carbamates reacted readily with various
Phenyl 4,5-Dichloro-6-Oxopyridazine-1(6H)-Carboxylate as Carbonyl Source: Facile and Selective Synthesis of Carbamates and Ureas under Mild Conditions
作者:Yong-Jin Yoon、Hyung-Geun Lee、Min-Jung Kim、Song-Eun Park、Jeum-Jong Kim、Bo Kim、Sang-Gyeong Lee
DOI:10.1055/s-0029-1217997
日期:2009.10
The selective syntheses of carbamates, symmetric ureas, and unsymmetrical ureas have been accomplished by the reaction of amines with phenyl 4,5-dichloro-6-oxopyridazine-1(61H)-carboxylate as a carbonyl source under mild conditions. It is noteworthy that this process is mild, economic, and convenient.
An alternative route has been developed for the construction of multisubstituted pyrrole derivatives from readily available, doublyactivatedcyclopropanes and anilines using an iron-mediated oxidation dominoreaction (i.e., sequential ring-opening, cyclization, and dehydrogenation reactions). This reaction uses readily available reactants and is tolerant of a broad range of substrates, with the desired
[EN] CELL ADHESION INHIBITORS<br/>[FR] INHIBITEURS DE L'ADHERENCE CELLULAIRE
申请人:BIOGEN, INC.
公开号:WO1996022966A1
公开(公告)日:1996-08-01
(EN) The present invention relates to novel compounds that are useful for inhibition and prevention of cell adhesion and cell adhesion-mediated pathologies. This invention also relates to pharmaceutical formulations comprising these compounds and methods of using them for inhibition and prevention of cell adhesion and cell adhesion-mediated pathologies. The compounds and pharmaceutical compositions of this invention can be used as therapeutic or prophylactic agents. They are particularly well-suited for treatment of many inflammatory and autoimmune diseases.(FR) L'invention concerne de nouveaux composés utiles pour inhiber et prévenir l'adhérence cellulaire, ainsi que les pathologies provoquées par l'adhérence cellulaire. Elle concerne également des compositions pharmaceutiques contenant ces composés, ainsi que des procédés permettant de les utiliser pour inhiber et prévenir l'adhérence cellulaire et les pathologies provoquées par l'adhérence cellulaire. On peut utiliser ces composés et ces compositions pharmaceutiques en tant qu'agents thérapeutiques et prophylactiques. Ils sont particulièrement appropriés pour le traitement de nombreuses maladies inflammatoires et auto-immunes.