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
A Versatile Tripodal Cu(I) Reagent for C–N Bond Construction via Nitrene-Transfer Chemistry: Catalytic Perspectives and Mechanistic Insights on C–H Aminations/Amidinations and Olefin Aziridinations
作者:Vivek Bagchi、Patrina Paraskevopoulou、Purak Das、Lingyu Chi、Qiuwen Wang、Amitava Choudhury、Jennifer S. Mathieson、Leroy Cronin、Daniel B. Pardue、Thomas R. Cundari、George Mitrikas、Yiannis Sanakis、Pericles Stavropoulos
DOI:10.1021/ja503869j
日期:2014.8.13
intermediates play a major role and are generated by hydrogen-atom abstraction from substrate C-H bonds or initial nitrene-addition to one of the olefinic carbons. Subsequent processes include solvent-caged radical recombination to afford the major amination and aziridination products but also one-electron oxidation of diffusively free carboradicals to generate amidination products due to carbocation
A generalized, simple and efficient transfer hydrogenation of unsaturated bonds has been developed using HBPin and various proton reagents as hydrogen sources. The substrates, including alkenes, alkynes, aromatic heterocycles, aldehydes, ketones, imines, azo, nitro, epoxy and nitrile compounds, are all applied to this catalytic system. Various groups, which cannot survive under the Pd/C/H2 combination
使用HBPin和各种质子试剂作为氢源,已经开发了一种普遍,简单而有效的不饱和键转移加氢方法。包括烯烃,炔烃,芳族杂环,醛,酮,亚胺,偶氮,硝基,环氧和腈化合物在内的所有底物均应用于该催化体系。可以容忍在Pd / C / H 2组合下无法生存的各种基团。研究了反应物的活性,其变化趋势为:苯乙烯>二苯基甲亚胺>苯甲醛>偶氮苯>硝基苯>喹啉>苯乙酮>苄腈。还研究了带有两个或多个不同不饱和键的底物,并以优异的化学选择性发生了转移氢化。由Pd(OAc)2和HBPin生成的二氧化钛极大地提高了TH效率。此外,使用D 2 O和HBPin通过原位HD生成和区分,实现了末端芳族烯烃的化学选择性抗Markovnikov加氢氘。
Copper-Catalyzed Direct C–H Alkylation of Polyfluoroarenes by Using Hydrocarbons as an Alkylating Source
作者:Weilong Xie、Joon Heo、Dongwook Kim、Sukbok Chang
DOI:10.1021/jacs.0c00169
日期:2020.4.22
Construction of carbon-carbon bonds is one of the most important tools in chemical synthesis. In the previously established cross-coupling reactions, prefunctionalized starting materials are employed usually in the form of aryl- or alkyl (pseudo)halides or their metallated derivatives. However, direct use of arenes and alkanes via a twofold oxidative C-H bond activation strategy to access chemoselective C(sp2)-C(sp3)
Fungal hydroxylation of ethyl benzene and derivatives
作者:Herbert L. Holland、Ian M. Carter、P.Chinna Chenchaiah、Shaheer H. Khan、Benito Munoz、Ronald W. Ninniss、Denise Richards
DOI:10.1016/s0040-4039(00)99013-0
日期:——
The fungus Mortierella isabellina converts ethyl benzene and a number of parasubstituted derivatives to the corresponding optically active 1-phenylethanols with enantiomeric excesses between 5 and 40%. Hydrogen removal from the substrate preceeds product formation and is stereochemically independent of it.