The direct conversion of carbamates to ureas using aluminum amides
摘要:
The conversion of carbamates into ureas using aluminum amide complexes is reported. This reaction is a convenient method to prepare bi-, tri- and tetra-substituted ureas from carbamate-protected primary or secondary amines by reaction with primary or secondary amines in the presence of stoichometric quantities of trimethylaluminum. A reactivity trend of the various carbamates was observed and methyl and benzyl carbamates were reacted selectively in the presence of t-butyl carbamates. (C) 2004 Elsevier Ltd. All rights reserved.
[EN] AROYL-O-PIPERIDINE DERIVATIVES FOR THE TREATMENT OF DIABETES-RELATED PROBLEMS<br/>[FR] DERIVES D'AROYL-O-PIPERIDINE POUR LE TRAITEMENT DE TROUBLES LIES AU DIABETE
申请人:MERCK PATENT GMBH
公开号:WO2005121091A1
公开(公告)日:2005-12-22
The present invention relates to derivatives of aroyl-O-piperidine structure of the general formula (I): in which R1, R2, R3 and R4 are as defined in the description. Application of the compounds of the formula (I) to the treatment of hyper-triglyceridaemia, hypercholesterolaemia and dyslipidaemia, and to the prevention or treatment of obesity.
A sustainable approach for the catalytic synthesis of unsymmetricalureas from disilylamines through catalytic activation of carbon dioxide as a C1 building block under ambient pressure was performed by using a commercially available easy-to-handle NH4VO3. This catalytic system displayed a wide range of substrate applicability without the use of any dehydrating reagents or bases. Gram-scale catalytic
通过使用市售的易于处理的 NH 4 VO 3,在环境压力下催化活化二氧化碳作为 C1 结构单元,从二甲硅烷胺催化合成不对称脲的可持续方法。该催化体系在不使用任何脱水试剂或碱的情况下表现出广泛的底物适用性。成功进行了克级催化反应,以验证在环境二氧化碳压力下催化合成不对称尿素的可扩展性。
Sulfonylharnstoffe, Verfahren zu ihrer Herstellung und pharmazeutische Präparate enthaltend diese Verbindungen
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0031058A1
公开(公告)日:1981-07-01
Sulfonylharnstoffe der Formel
worin R', X und Y die angegebenen Bedeutungen haben, sowie deren physiologisch verträgliche Salze, pharmazeutische Präparate auf Basis dieser Verbindungen und ihre Verwendung bei der Behandlung des Diabetes.
式中 R'、X 和 Y 的含义
式中 R'、X 和 Y 的含义,以及它们的生理耐受盐、基于这些化合物的药物制剂和它们在治疗糖尿病中的用途。
ARYA V. P.; DAVID J.; GREWAL R. S., INDIAN J. CHEM. <IJOC-AP>, 1977, B 15, NO 7, 635-640
作者:ARYA V. P.、 DAVID J.、 GREWAL R. S.
DOI:——
日期:——
HETEROCYCLIC COMPOUNDS AS INHIBITORS OF ROTAMASE ENZYMES