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。
Brønsted Acid Catalyzed Functionalization of Aromatic Alcohols through Nucleophilic Substitution of Hydroxyl Group
作者:Abhishek Kumar Mishra、Srijit Biswas
DOI:10.1021/acs.joc.5b02849
日期:2016.3.18
have been substituted by O-, S-, N-, and C-centered nucleophiles under solvent-free reaction conditions. The products are generated in good to excellent yields. para-Toluenesulfonic acid exhibits the best catalytic activity compared to other Brønstedacids. Experimental observations suggest that the reaction proceeds through the intermediacy of the keto tautomer of naphthol. Nucleophilic addition to
在无溶剂反应条件下,萘酚和互变异构酚衍生物的羟基已被O-,S-,N-和C中心的亲核试剂取代。产生的产品良率极佳。与其他布朗斯台德酸相比,对甲苯磺酸显示出最佳的催化活性。实验观察表明该反应通过萘酚的酮互变异构体的中间体进行。亲核加成到羰基上,然后除去水,得到所需产物。本方法提供了对取代的萘[2,1- b ]呋喃衍生物的访问。使用N生成的产品以中心为中心的亲核试剂可以进一步转化为重要种类的有机分子,例如苯并咔唑和咪唑衍生物。
Semiheterogeneous Dual Nickel/Photocatalytic (Thio)etherification Using Carbon Nitrides
作者:Cristian Cavedon、Amiera Madani、Peter H. Seeberger、Bartholomäus Pieber
DOI:10.1021/acs.orglett.9b01957
日期:2019.7.5
nitride material can be combined with homogeneous nickel catalysts for light-mediated cross-couplings of aryl bromides with alcohols under mild conditions. The metal-free heterogeneous semiconductor is fully recyclable and couples a broad range of electron-poor aryl bromides with primary and secondaryalcohols as well as water. The application for intramolecular reactions and the synthesis of active pharmaceutical
作者:Radha Bam、Alexandros S. Pollatos、Austin J. Moser、Julian G. West
DOI:10.1039/d0sc05925k
日期:——
Herein we report a light-driven B12-based catalytic system that leverages this reactivity to convert alkyl electrophiles to olefins under incredibly mild conditions using only earth abundant elements. Further, this process exhibits a high level of regioselectivity, producing terminal olefins in moderate to excellent yield and exceptional selectivity. Finally, we are able to access a hitherto-unknown
脱卤化氢或消除卤化氢等价物仍然是安装生物学上重要的烯烃官能团的最简单方法之一。然而,这种转化通常需要苛刻的强碱性条件、稀有贵金属或两者兼而有之,限制了其在复杂分子合成中的适用性。Nature 在新型维生素 B 12依赖性光感受器 CarH 中寻求一种补充方法,其中钴-碳键的光解导致在温和的生理相关条件下选择性形成烯烃。在这里,我们报告了一个光驱动的 B 12基于催化系统,利用这种反应性在极其温和的条件下仅使用地球丰富的元素将烷基亲电子试剂转化为烯烃。此外,该工艺表现出高水平的区域选择性,以中等至优异的收率和出色的选择性生产末端烯烃。最后,我们能够使用两种钴催化剂串联使用迄今为止未知的转化,远程消除来生产具有优异区域选择性的亚末端烯烃。我们一起展示了维生素 B 12是开发温和烯烃形成反应的强大平台。
[EN] SELECTIVE TRANSITION METAL CATALYZED DEUTERIUM INCORPORATION INTO ALKYNE AND ALKENE FUNCTIONALITIES<br/>[FR] INCORPORATION SÉLECTIVE DE DEUTÉRIUM CATALYSÉ PAR MÉTAL DE TRANSITION DANS DES FONCTIONNALITÉS ALCYNE ET ALCÈNE
申请人:UNIV MARQUETTE
公开号:WO2022094420A1
公开(公告)日:2022-05-05
Disclosed herein are deuterated compounds and transition metal catalyzed methods for making deuterated compounds. The disclosed methods are regioselective and enantioselective and may be utilized to prepare isomerically and/or enantiomerically pure or enriched deuterated compounds. The disclosed methods also may be modified in order to prepared fluorinated compounds.