Novel Indolylindazolylmaleimides as Inhibitors of Protein Kinase C-β: Synthesis, Biological Activity, and Cardiovascular Safety
摘要:
Novel indolylindazolylmaleimides were synthesized and examined for kinase inhibition. We identified low-nanomolar inhibitors of PKC-beta with good to excellent selectivity vs other PKC isozymes and GSK-3 beta. In a cell-based functional assay, 8f and 8i effectively blocked IL-8 release induced by PKC-beta II (IC50 = 20-25 nM). In cardiovascular safety assessment, representative lead compounds bound to the hERG channel with high affinity, potently inhibited ion current in a patch-clamp experiment, and caused a dose-dependent increase of QT(c) in guinea pigs.
A General Palladium-Phosphine Complex To Explore Aryl Tosylates in the N-Arylation of Amines: Scope and Limitations
作者:Pui Ying Choy、Kin Ho Chung、Qingjing Yang、Chau Ming So、Raymond Wai-Yin Sun、Fuk Yee Kwong
DOI:10.1002/asia.201800575
日期:2018.9.4
heterocycles such as indole, carbazole, pyrrole, 10‐phenothiazine, and 10‐phenoxazine were shown to be feasible coupling partners under this catalytic system. The described reaction conditions tolerate a wide range of functional groups and allow an array of aromatic amines as well as unsymmetrical amine products to be easily accessed from the various phenolic derivatives. Interestingly, this catalyst
CN Coupling of Indoles and Carbazoles with Aromatic Chlorides Catalyzed by a Single-Component NHC-Nickel(0) Precursor
作者:Silvia G. Rull、Juan F. Blandez、Manuel R. Fructos、Tomás R. Belderrain、M. Carmen Nicasio
DOI:10.1002/adsc.201500030
日期:2015.3.23
A new and efficient nickel‐based protocol for the N‐arylation of indoles and carbazoles with aromaticchlorides, the least expensive of the aryl halides, is described. The procedure provides selectively N‐(hetero)arylation products in good to high yields, in short reaction times and without adding an excess of ligands.
Transition-Metal-Free Ring-Opening Silylation of Indoles and Benzofurans with (Diphenyl-<i>tert</i>
-butylsilyl)lithium
作者:Pan Xu、Ernst-Ulrich Würthwein、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.201707309
日期:2017.10.23
A practical method is presented for ring opening various indoles and benzofurans with concomitant stereoselective silylation using readily generated (diphenyl‐tert‐butylsilyl)lithium to afford ortho‐β‐silylvinylanilines or ‐phenols. Dearomatization of the heteroarene core proceeds in the absence of any transition‐metal catalyst through addition of a silyl anion and a subsequent stereoselective β‐elimination
Palladium-Catalyzed Three-Component Regioselective Dehydrogenative Coupling of Indoles, 2-Methylbut-2-ene, and Carboxylic Acids
作者:Xing-Long Zhang、Rui-Li Guo、Meng-Yue Wang、Bao-Yin Zhao、Qiong Jia、Jin-Hui Yang、Yong-Qiang Wang
DOI:10.1021/acs.orglett.1c03776
日期:2021.12.17
Five-carbon (C5) structural units are the fundamental building blocks of many natural products. An unprecedented palladium-catalyzed three-component dehydrogenative cascade coupling of indoles, 2-methylbut-2-ene, and carboxylicacids has been developed. The approach enables the straightforward introduction of a C3′-bonded five-carbon structural unit with a tertiary alcohol quaternary carbon center
metal-catalysed reactions rely on stoichiometric quantities of an exogenous base to enable catalytic turnover. Despite playing a fundamental role, the base poses major challenges, such as restricting the accessible chemical space or causing heterogeneous reaction mixtures. Here we introduce a unifying strategy that eliminates the need for an exogenous base through the use of non-innocent electrophiles (NIE)
许多重要的过渡金属催化反应依赖于化学计量数量的外源碱来实现催化周转。尽管发挥了基础性作用,但碱基也带来了重大挑战,例如限制可接近的化学空间或导致多相反应混合物。在这里,我们介绍了一种统一策略,该策略通过使用非无辜亲电试剂 (NIE) 消除了对外源碱基的需求,NIE 配备了在反应过程中以受控方式释放的掩蔽碱基。通过将多个传统上依赖碱基的催化反应转变为外源无碱基均相过程,证明了这一概念的普遍适用性。此外,NIE 的优势特性在多个应用中得到了证明,例如在基于微摩尔级荧光的测定中。这导致发现了使用异丙醇作为良性还原剂的氨基甲酸芳基酯的镍催化脱氧反应。在更广泛的背景下,这项工作为 NIE 在催化中的战略利用提供了概念蓝图。