Ligand-Free Palladium-Catalyzed Aerobic Oxidative Coupling of Carboxylic Anhydrides with Arylboronic Acids
作者:Weiyan Yin、Haifeng He、Yani Zhang、Tong Long
DOI:10.1002/asia.201402314
日期:2014.9
We report a new, effective and environmentally friendly protocol for selective aerobic oxidativecoupling of arylboronicacids with carboxylic anhydrides in the presence of ligand‐free palladium catalyst. The aryl benzoates are obtained in good to excellent yields.
[EN] ELECTRONIC TUNING OF SITE SELECTIVITY<br/>[FR] AJUSTEMENT ÉLECTRONIQUE DE SÉLECTIVITÉ DE SITE
申请人:UNIV ILLINOIS
公开号:WO2014059436A1
公开(公告)日:2014-04-17
Site-selective functionalization of Amphotericin B has been achieved by simply modifying the electronic nature of the reagents. A Hammett analysis is consistent with linking of this phenomenon to the Hammond postulate: electronic tuning to a more product- like transition state amplifies site-discriminating interactions between a reagent and its substrate. Electronic tuning of both an acylpyridinium donor and its carboxylate counterion further promoted site-divergent functionalization. A range of modifications to one of the many hydroxyl groups appended to the ion channel-forming natural product amphotericin B was achieved.
for the preparation of a number of symmetric carboxylic anhydrides was reported using Cu2(BDC)2(DABCO) as an efficient heterogeneous catalyst via the C–H bond activation of aldehydes with excellent yields and simple work up. This C–H bond activation reaction appears simple and convenient, has a wide substrate scope and makes use of cheap, abundant, and easily available reagents. The Cu-MOF catalyst was
在本文中,报道了一种使用 Cu 2 (BDC) 2 (DABCO) 作为高效多相催化剂,通过醛的 C-H 键活化来制备多种对称羧酸酐的有效且简单的合成方法,具有优异的收率和简单的工作。该C-H键活化反应简单方便,底物范围广,试剂廉价、丰富、易得。 Cu-MOF催化剂被回收并重复使用四次,没有任何催化活性损失。
ARYLOYL(OXY OR AMINO)PENTAFLUOROSULFANYLBENZENE COMPOUND, PHARMACEUTICALLY ACCEPTABLE SALT THEREOF, AND PRODRUGS THEREOF
申请人:UBE INDUSTRIES, LTD.
公开号:US20160244407A1
公开(公告)日:2016-08-25
An aryloyl(oxy or amino)pentafluorosulfanylbenzene compound having pharmacological action. The aryloyl(oxy or amino)pentafluorosulfanylbenzene compound is represented by general formula (A-I), a pharmaceutically acceptable salt thereof, and a prodrug thereof,
wherein all of parameters represent the same meanings as defined in the specification.
[EN] POLYENE POLYKETIDES, PROCESSES FOR THEIR PRODUCTION AND THEIR USE AS A PHARMACEUTICAL<br/>[FR] POLYKETIDES DE POLYENE, LEURS PROCESSUS DE PRODUCTION ET LEUR UTILISATION EN TANT QUE PRODUIT PHARMACEUTIQUE
申请人:ECOPIA BIOSCIENCES INC
公开号:WO2004065401A1
公开(公告)日:2004-08-05
This invention relates to a new class of polyene polyketides, their pharmaceutically acceptable salts and derivatives, and to methods for obtaining the compounds. One method of obtaining these compounds is by cultivation of novel strains of Streptomyces aizunensis; another method involves expression of biosynthetic pathway genes in transformed host cells. The present invention further relates to the novel strains of Streptomyces aizunensis used to produce these compounds, to the use of these compounds and their pharmaceutically acceptable salts and derivatives as pharmaceuticals, in particular to their use as inhibitors of fungal cell growth and cancer cell growth. The invention also relates to pharmaceutical compositions comprising these novel polyketides or a pharmaceutically acceptable salts or derivatives thereof. Finally, the invention relates to novel polynucleotide sequences and their encoded proteins, which are involved in the biosynthesis of these novel polyketides.