The first general methodology for the directthiolation of electron‐rich heteroarenes was developed by employing Pd/Al2O3, a recoverable and commercially available heterogeneous catalyst, and CuCl2. This method represents an operationally simple approach for the synthesis of these valuable compounds. Preliminary mechanistic studies indicate a heterogeneous catalytic system, in which both metals play
通过使用Pd / Al 2 O 3(一种可回收和可商购的非均相催化剂)和CuCl 2开发了第一种富电子杂芳烃直接硫醇化的通用方法。该方法代表了用于合成这些有价值的化合物的操作简单的方法。初步的机理研究表明,多相催化体系中的两种金属在硫醇化产物的形成中起着互补的作用。
Sterically hindered N-aryl/benzyl substituted piperidoimidazolin-2-ylidene palladium complexes and their catalytic activities
作者:Elif Gacal、Serpil Denizaltı、Armağan Kınal、Aytaç Gürhan Gökçe、Hayati Türkmen
DOI:10.1016/j.tet.2018.10.003
日期:2018.11
cross coupling. The N-aryl substituted complex 3b was a highly efficient precatalyst and successfully employed in Suzuki-Miyaura cross coupling reactions of (hetero)aryl chlorides with arylboronic acids in air. In addition, the oxidativeaddition step of the reaction mechanism involving chlorobenzene and the catalysts 3a, 3b, 3c and 3d were computationally investigated by the DFT-ω-B97X-D method and
制备了一系列的N-芳基(2a,b)或苄基(2c,d)取代的哌啶并咪唑啉盐及其钯配合物(3a - d),并通过1 H,13 C NMR,IR光谱和元素分析进行了表征。3a和3c的晶体结构已经通过X射线晶体学确定。热重分析(TGA)用于复合物(3a – d)。钯配合物已被用作铃木-宫浦交叉偶联的催化剂。N-芳基取代的配合物3b是一种高效的预催化剂,已成功用于空气中(杂)芳基氯与芳基硼酸的Suzuki-Miyaura交叉偶联反应。此外,通过DFT-计算方法研究了涉及氯苯与催化剂3a,3b,3c和3d的反应机理的氧化加成步骤。ω-B97X-D法与催化结果完全吻合。为了测量新配体的σ-给体和π-受体性质,还制备了羰基铑配合物。
Sterically Controlled C−H Olefination of Heteroarenes
substituted heteroarenes in nature and bioactive compounds. Some substitution patterns remain challenging: While highly efficient methods for the C2‐selective olefination of 3‐substituted five‐membered heteroarenes have been reported, analogous methods to access the 5‐olefinated products have remained limited by poor regioselectivities and/or the requirement to use an excess of the valuable heteroarene starting
Compounds are described that are active on at least one of PPARα, PPARδ, and PPARγ, which are useful for therapeutic and/or prophylactic methods involving modulation of at least one of PPARα, PPARδ, and PPARγ.
Nickel-Catalyzed Csp<sup>2</sup>–Csp<sup>3</sup>Bond Formation via C–F Bond Activation
作者:Yee Ann Ho、Matthias Leiendecker、Xiangqian Liu、Chengming Wang、Nurtalya Alandini、Magnus Rueping
DOI:10.1021/acs.orglett.8b02351
日期:2018.9.21
A nickel-catalyzed cross coupling of aryl fluorides via C–Fbondactivation has been developed. The alkylation method allows selective replacement of aryl fluorides by alkyl groups and enables the synthesis of diverse and otherwise difficult to access scaffolds in good yields.