Chemoselective, Scalable Nickel‐Electrocatalytic
<i>O</i>
‐Arylation of Alcohols
作者:Hai‐Jun Zhang、Longrui Chen、Martins S. Oderinde、Jacob T. Edwards、Yu Kawamata、Phil S. Baran
DOI:10.1002/anie.202107820
日期:2021.9.13
The formation of aryl-alkyl ether bonds through cross coupling of alcohols with aryl halides represents a useful strategic departure from classical SN2 methods. Numerous tactics relying on Pd-, Cu-, and Ni-based catalytic systems have emerged over the past several years. Herein we disclose a Ni-catalyzed electrochemically driven protocol to achieve this useful transformation with a broad substrate
通过醇与芳基卤的交叉偶联形成芳基-烷基醚键代表了对经典S N 2 方法的有用的战略偏离。过去几年出现了许多依赖钯基、铜基和镍基催化系统的策略。在此,我们公开了一种镍催化电化学驱动方案,以一种操作简单的方式在广泛的底物范围内实现这种有用的转化。这种电化学方法不需要强碱、昂贵的外源过渡金属催化剂(例如铱、钌),并且可以轻松地在批量或流动设置中扩大规模。有趣的是,与机械相关的光化学变体相比,电子醚化表现出增强的底物范围,因为它耐受醇亲核试剂中的叔胺官能团。
Conversion of Cyclohexanones to Alkyl Aryl Ethers by Using a Pd/C-Ethylene System
The conversion of cyclohexanone and substituted cyclohexanones to alkylarylethersusing a Pd/C-ethylene system is discussed, where ethylene functions as a hydrogen acceptor. The obtained ethers are easily transformed into the corresponding phenols by treatment with BBr3. Direct conversion of cyclohexenone to phenol in the presence of a catalytic amount of Pd/C under an ethylene atmosphere is also
Improvement of Pharmacological Properties of Irreversible Thyroid Receptor Coactivator Binding Inhibitors
作者:Jong Yeon Hwang、Leggy A. Arnold、Fangyi Zhu、Aaron Kosinski、Thomas J. Mangano、Vincent Setola、Bryan L. Roth、R. Kiplin Guy
DOI:10.1021/jm9002704
日期:2009.7.9
We have previously reported the discover), and preliminary structure activity relationships of a series of beta-aminoketones that disrupt the binding of coactivators to TR. However, the most active compounds had moderate inhibitory potency and relatively high cytotoxicity, resulting in narrow therapeutic index. Additionally, preliminary evaluation of in vivo toxicology revealed a significant dose related cardiotoxicity. Here we describe the improvement of pharmacological properties of thyroid hormone receptor coactivator binding inhibitors. A comprehensive Survey of the effects of substitutents in key areas of the molecule was carried out based on mechanistic insight from the earlier report. This study revealed that both electron withdrawing and hydrophobic substituents on the aromatic ring led to higher potency. On the other hand, moving from an alkyl to a sulfonyl alkyl side chain led to reduced cytotoxicity, Finally, utilization of airline moieties having low pK(a)'s resulted in lowered ion channel activity without any loss of pharmacological activity.