Synthesis and biological evaluation of piperazinyl carbamates and ureas as fatty acid amide hydrolase (FAAH) and transient receptor potential (TRP) channel dual ligands
摘要:
The evaluation of a series of piperazinyl carbamates and ureas, designed on the basis of previously reported TRPV1 antagonists and FAAH inhibitors, led to the identification of some 'dual-action' compounds targeting both FAAH and TRPV1 or TRPA1 receptors. (C) 2009 Elsevier Ltd. All rights reserved.
β-Type Glycosidic Bond Formation by Palladium-Catalyzed Decarboxylative Allylation
作者:Shaohua Xiang、Zhiqiang Lu、Jingxi He、Kim Le MaiHoang、Jing Zeng、Xue-Wei Liu
DOI:10.1002/chem.201303241
日期:2013.10.11
Decarboxylativeallylation of glycals: A β‐type glycosidic bond has been constructed in high regio‐ and stereoselectivity by means of a palladium‐catalyzeddecarboxylative O‐glycosylation. Various kinds of glycals with different protecting groups have been examined for this reaction to afford a diverse set of glycosylated products, including phenolic O‐glycosides, thiophenolic S‐glycoside, aliphatic
Herein, we report the development of a tailored cobalt catalyst system of Cp*Co(III)(LX) toward intramolecular C-H nitrene insertion of azidoformates to afford cyclic carbamates. The cobalt complexes were easy to prepare and bench-stable, thus offering a convenient reaction protocol. The catalytic reactivity was significantly improved by the electronic tuning of the bidentate LX ligands, and the observed
Asymmetric O-to-C Aryloxycarbonyl Migration of Indolyl Carbonates Using Single-Handed Dynamic Helical Polyquinoxalines Bearing 4-Aminopyridyl Groups as Chiral Nucleophilic Catalysts
xycarbonyl groups on both the nitrogen and oxygen atoms showed high reactivity, giving oxindoles with a quaternary stereogenic carbon center at their 3-positions in up to 97:3 enantiomeric ratio in THF. The macromolecular catalysts underwent inversion of their helix sense by solvent effect, allowing the same catalyst to give the opposite enantiomer in a mixture of methyl t-butyl ether and 1,1,2-trichloroethane
The invention relates to a method of preparing aromatic polycarbonate according to the two-phase interface process. The molecular weight is controlled by the addition of a chain stopper. The use of a phenolic chloroformate as a chain stopper leads to a polycarbonate having a low content of volatile constituents.
In a continuous flow reactor one or more bisphenols is converted by the action of phosgene and aqueous base into a mixture of mono- and bisphenol chloroformates which are then treated with a catalyst, additional aqueous caustic and a monophenol to afford endcapped polycarbonates. At relatively high levels of added monophenol endcapped polycarbonate oligomers are obtained. The method is especially suited for the continuous preparation of endcapped oligomers of tetrabromobisphenol A polycarbonate. The method is characterized by efficient use of phosgene, and conversion of chloroformate groups to carbonate linkages aided by trialkylamine catalysts bearing at least one methyl group on nitrogen, such as N,N-dimethylbutylamine (DMBA).
在一个连续流动的反应器中,一种或多种双酚在光气和水碱的作用下转化成单酚和双酚氯甲酸酯混合物,然后用催化剂、额外的水性苛性碱和单酚进行处理,得到端帽聚碳酸酯。当添加的单酚含量较高时,可得到端帽聚碳酸酯低聚物。该方法特别适用于连续制备四溴双酚 A 聚碳酸酯的内封端低聚物。该方法的特点是高效使用光气,并在氮上含有至少一个甲基的三烷基胺催化剂(如 N,N-二甲基丁胺(DMBA))的帮助下,将氯甲酸酯基团转化为碳酸酯链节。