N‐Heterocyclic Carbenes: Useful Ligands for the Palladium‐Catalysed Direct C5 Arylation of Heteroaromatics with Aryl Bromides or Electron‐Deficient Aryl Chlorides
Pd-N-heterocyclic carbene complexes have been prepared and employed for palladium-catalysed directarylation of heteroaromatic derivatives by using aryl halides. These catalyst precursors promote the coupling of challenging aryl halides such as deactivated or congested arylbromides and also activated aryl chlorides. This procedure employs only 1 mol-% of an air-stable palladium complex. This is a
[EN] THIAZOLYL-SUBSTITUED TETRACYCLIC COMPOUNDS AND METHODS OF USE THEREOF FOR TREATMENT OF VIRAL DISEASES<br/>[FR] COMPOSÉS TÉTRACYCLIQUES SUBSTITUÉS PAR THIAZOLYLE ET LEURS PROCÉDÉS D'UTILISATION POUR LE TRAITEMENT DE MALADIES VIRALES
申请人:MERCK SHARP & DOHME
公开号:WO2014110687A1
公开(公告)日:2014-07-24
The present invention relates to novel Thiazolyl-Substituted Tetracyclic Compounds of Formula (I) and pharmaceutically acceptable salts thereof, wherein A, A', R2R3, R4 and R5 are as defined herein. The present invention also relates to compositions comprising at least one Thiazolyl-Substituted Tetracyclic Compound, and methods of using the Thiazolyl-Substituted Tetracyclic Compounds for treating or preventing HCV infection in a patient.
Cyclopentyl Methyl Ether: An Alternative Solvent for Palladium-Catalyzed Direct Arylation of Heteroaromatics
作者:Kassem Beydoun、Henri Doucet
DOI:10.1002/cssc.201000405
日期:2011.4.18
Some ethers, such as cyclopentyl methylether and di‐n‐butyl ether, which can be considered as “greener” solvents than N,N‐dimethylacetamide (DMAc) or DMF, can be advantageously employed for the palladium‐catalyzed direct arylation of heteroaromatics. In the presence of such ethers and only 0.5–1 mol % of palladium catalysts at 125–150 °C, the direct 5‐arylation of thiazoles, thiophenes, or furans
compounds were fully characterized by 1H, 13C1H} NMR and FT-IR spectra. The structures of 2c, 2d, and 2e were determined by X-ray crystallography and the prepared complexes (2a-e) were investigated as catalysts for the direct arylation of 2-n-propylthiazole, 4,5-dimethylthiazole and 2-acetylthiophene with various aryl bromides. High catalytic activity for arylation was seen reaction using only 0.5 mol%
在富含电子的杂芳烃的情况下,可以使用芳基卤化物活化特定的C H键进行芳基化,而无需指导该基团。容易产生卤素取代的芳基化杂芳烃的能力在有机化学中很重要,因为这些物种是生物化学家的重要组成部分。在此手稿中,我们报告了PEPPSI型新型苯并咪唑基N-杂环卡宾-钯(II)配合物(2a-e)的合成。所有这些新化合物均通过1 H,13 C 1 H} NMR和FT-IR光谱进行了全面表征。通过X射线晶体学确定2c,2d和2e的结构,并制备配合物(研究了2a-e)作为2-正丙基噻唑,4,5-二甲基噻唑和2-乙酰基噻吩与各种芳基溴直接芳基化的催化剂。仅使用0.5mol%的催化剂反应1小时,观察到高的芳基化催化活性。