2-取代的吲哚和苯并呋喃的合成是通过亲核芳族取代,随后在亲核体和邻乙炔之间进行5-endo-dig环化来实现的。乙炔起着吸电子基团的双重作用,以激活S N Ar的底物,而C1-C2碳骨架则用于新形成的5元杂芳族环。这种方法可以使Ar–X–N / O–C1的键形成顺序在一个合成步骤中进行,从而以中等至高收率提供吲哚和苯并呋喃。由于该方法不是过渡金属介导的,因此可以耐受溴化和氯化的底物,可以使用水或水-DMSO混合物作为溶剂进行苯并呋喃的形成。
[EN] TRIAZOLOPYRIDINE INHIBITORS OF MYELOPEROXIDASE AND/OR EPX<br/>[FR] INHIBITEURS DE LA MYÉLOPEROXYDASE ET/OU DE L'EPX À BASE DE TRIAZOLOPYRIDINES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2017161145A1
公开(公告)日:2017-09-21
The present invention provides compounds of Formula (I); wherein the substituents are each as defined in the specification, and compositions comprising any of such novel compounds. These compounds are myeloperoxidase (MPO) inhibitors and/or eosinophil peroxidase (EPX) inhibitors, and may be useful for for the treatment and/or prophylaxis of atherosclerosis, heart failure, chronic obstructive pulmonary disease (COPD), and related diseases.
Synthesis and characterization of novel chiral NHC–palladium complexes and their application in copper-free Sonogashira reactions
作者:Longguang Yang、Pei Guan、Pan He、Qian Chen、Changsheng Cao、Yu Peng、Zhan Shi、Guangsheng Pang、Yanhui Shi
DOI:10.1039/c2dt12391f
日期:——
A new series of chiral N-heterocyclic carbene (NHC) palladium complexes were synthesized from a relatively inexpensive amino acid, L-phenylalanine. All these compounds were fully characterized by 1H-NMR, 13C-NMR and elemental analysis. The X-ray molecular structures of two of the complexes were reported. The catalytic activity of the four palladium complexes was successfully tested in the Sonogashira reaction under copper free conditions in air. The palladium complex 3a provided good activity in the Sonogashira coupling reaction.
Gold and Palladium Combined for the Sonogashira Coupling of Aryl and Heteroaryl Halides
作者:Tarun Sarkar、Biswajit Panda
DOI:10.1055/s-0032-1318119
日期:——
transmetalation step. A highly efficient gold and palladium combined methodology for the Sonogashiracoupling of a wide array of electronically and structurally diverse aryl and heteroaryl halides is described. The orthogonal reactivity of the two metals shows high selectivity and extreme functional group tolerance in Sonogashiracoupling. A brief mechanistic study reveals that the gold acetylide intermediate enters
Metal-Free Iodine-Catalyzed Oxidation of Ynamides and Diaryl Acetylenes into 1,2-Diketo Compounds
作者:Seung Woo Kim、Tae-Woong Um、Seunghoon Shin
DOI:10.1021/acs.joc.8b00484
日期:2018.4.20
Metal-free oxidation of ynamides is described, employing pyridine-N-oxides as oxidants under molecular iodine catalysis. In stark contrast to Brønsted acid catalysis, iodophilic activation of ynamides diverts the reaction manifold into a dioxygenation pathway. This oxidation is very rapid at room temperature with only 2.5 mol % I2. Furthermore, this protocol could be extended to nonactivated alkynes
Stereoselective Alkyne Hydrogenation by using a Simple Iron Catalyst
作者:Bernhard J. Gregori、Felix Schwarzhuber、Simon Pöllath、Josef Zweck、Lorena Fritsch、Roland Schoch、Matthias Bauer、Axel Jacobi von Wangelin
DOI:10.1002/cssc.201900926
日期:2019.8.22
stereoselective hydrogenation of alkynes constitutes one of the key approaches for the construction of stereodefined alkenes. The majority of conventional methods utilize noble and toxic metal catalysts. This study concerns a simple catalyst comprised of the commercial chemicals iron(II) acetylacetonate and diisobutylaluminum hydride, which enables the Z-selective semihydrogenation of alkynes under near ambient
炔烃的立体选择性加氢构成构造立体烯烃的关键方法之一。大多数常规方法利用贵金属和有毒金属催化剂。这项研究涉及一种由工业化学品乙酰丙酮铁(II)和氢化二异丁基铝组成的简单催化剂,该催化剂能够在接近环境条件(1-3 bar H2、30°C,5 mol%[Fe] )。既不需要复杂的催化剂制备也不需要添加配体。机理研究(动力学中毒,X射线吸收光谱法,TEM)强烈表明了小铁簇和颗粒催化剂的运行。