Room‐Temperature Palladium‐Catalyzed Deuterogenolysis of Carbon Oxygen Bonds towards Deuterated Pharmaceuticals
作者:Wei Ou、Xudong Xiang、Ru Zou、Qing Xu、Kian Ping Loh、Chenliang Su
DOI:10.1002/anie.202014196
日期:2021.3.15
Site‐specific incorporation of deuterium into drug molecules to study and improve their biologicalproperties is crucial for drug discovery and development. Herein, we describe a palladium‐catalyzed room‐temperature deuterogenolysis of carbon–oxygen bonds in alcohols and ketones with D2 balloon for practical synthesis of deuterated pharmaceuticals and chemicals with benzyl‐site (sp3 C−H) D‐incorporation. The
Earth-Abundant Metal Catalysis Enabled by Counterion Activation
作者:Riaz Agahi、Amy J. Challinor、Neil B. Carter、Stephen P. Thomas
DOI:10.1021/acs.orglett.8b03986
日期:2019.2.15
strategy has been developed for earth-abundant metal catalysisenabled by counterion dissociation and demonstrated through alkene hydroboration. Commercially available iron and cobalt tetrafluoroborate salts were found to catalyze the hydroboration of aryl and alkyl alkenes with good functional group tolerance (Fe, 12 substrates; Co, 13 substrates) with three structurally distinct ligands. Key to this endogenous
作者:Tjark H. Meyer、Ramesh C. Samanta、Antonio Del Vecchio、Lutz Ackermann
DOI:10.1039/d0sc05924b
日期:——
Manganaelectro-catalyzed azidation of otherwise inert C(sp3)–H bonds was accomplished using most user-friendly sodium azide as the nitrogen-source. The operationally simple, resource-economic C–H azidation strategy was characterized by mild reaction conditions, no directing group, traceless electrons as the sole redox-reagent, Earth-abundant manganese as the catalyst, high functional-group compatibility
使用大多数用户友好的叠氮化钠作为氮源,完成了锰电催化的惰性 C(sp 3 )–H 键的叠氮化。操作简单、资源经济的C-H叠氮化策略具有反应条件温和、无导向基团、无痕电子作为唯一氧化还原试剂、地球丰富的锰作为催化剂、高官能团相容性和高化学选择性等特点。生物活性化合物的后期叠氮化阶段。通过实验、分光光度法和循环伏安法进行的详细机理研究为金属催化脂肪族自由基的形成以及随后在锰( III / IV )流形内的叠氮基自由基转移提供了强有力的支持。
Direct Conversion of <i>N</i>-Alkylamines to <i>N</i>-Propargylamines through C–H Activation Promoted by Lewis Acid/Organocopper Catalysis: Application to Late-Stage Functionalization of Bioactive Molecules
作者:Jessica Z. Chan、Ahmet Yesilcimen、Min Cao、Yuyang Zhang、Bochao Zhang、Masayuki Wasa
DOI:10.1021/jacs.0c08599
日期:2020.9.23
In the past, such transformations were carried out under oxidative conditions, and the enantioselective variants were confined to tetrahydroisoquinoline derivatives. Here, we disclose a method for union of N-alkylamines and trimethylsilyl alkynes, without the presence of an external oxidant, and promoted through cooperative actions of two Lewis acids, B(C6F5)3 and a Cu-based complex. A variety of propargylamines
开发了一种将 N-烷基胺的 α-CH 键转化为 α-C-炔基键的有效催化方法。过去,这种转化是在氧化条件下进行的,对映选择性变体仅限于四氢异喹啉衍生物。在这里,我们公开了一种在不存在外部氧化剂的情况下结合 N-烷基胺和三甲基甲硅烷基炔的方法,并通过两种路易斯酸 B(C6F5)3 和 Cu 基络合物的协同作用进行促进。可以高非对映选择性和对映选择性合成多种炔丙胺。生物活性胺的后期位点选择性修饰证明了该方法的实用性。介绍了阐明催化过程的各种机制细微差别的动力学研究。
HYDRIDE TRANSFER TO CARBONIUM IONS: I. THE MECHANISM OF THE REDUCTION OF TRIPHENYLMETHYL CARBONIUM ION IN FORMIC ACID
作者:Ross Stewart
DOI:10.1139/v57-109
日期:1957.8.1
nuclear magnetic resonance spectroscopy to be greater than 99%. Use of this material in the reduction gave a kinetic isotope effect and led to isolation of triphenylmethane which had greater than 97% deuterium in the α-position, thus supporting the idea that a hydrideion was transferred from formate ion to the carbonium ion.The energy and entropy of activation for the rate controlling step have been found