Cobalt Catalyzed Functionalization of Unactivated Alkenes: Regioselective Reductive C−C Bond Forming Reactions
作者:Boris Gaspar、Erick M. Carreira
DOI:10.1021/ja904856k
日期:2009.9.23
The cobalt catalyzed hydroaldoximation and hydrocyanooximation of unactivatedalkenes is reported. Secondary and tertiary aldoximes and oximonitriles are synthesized with excellent regioselectivity under mild conditions, and conversion of the products to valuable intermediates is documented. The reactions expand the arsenal of reductive carbon-carbon bond forming reactions as well as regioselective
Control of selectivity is one of the central topics in organic chemistry. Although unprecedented alkoxyl‐radical‐induced transformations have drawn a lot of attention, compared to selective C−H activation, selective radical O−H activation remains less explored. Herein, we report a novel selective radical O−H activation strategy of diols by combining spatial effects with proton‐coupled electron transfer
Cobalt bis(acetylacetonate)–<i>tert</i>-butyl hydroperoxide–triethylsilane: a general reagent combination for the Markovnikov-selective hydrofunctionalization of alkenes by hydrogen atom transfer
作者:Xiaoshen Ma、Seth B Herzon
DOI:10.3762/bjoc.14.201
日期:——
and practical reagent combination to initiate a broad range of Markovnikov-selective alkene hydrofunctionalization reactions. These transformations are believed to proceed by cobalt-mediated hydrogen atom transfer (HAT) to the alkene substrate, followed by interception of the resulting alkyl radical intermediate with a SOMOphile. In addition, we report the first reductivecouplings of unactivated
Silver-Catalyzed Radical Transformation of Aliphatic Carboxylic Acids to Oxime Ethers
作者:Yuchao Zhu、Xiaojin Wen、Song Song、Ning Jiao
DOI:10.1021/acscatal.6b02074
日期:2016.10.7
ketones, amines, hydroxylamines, and nitriles. We describe the catalytic decarboxylation of aliphaticcarboxylicacids to oxime ethers. With AgNO3 as the catalyst, valuable oxime ethers bearing various substituents could be easily obtained. The broad substrate scope, easy accessibility of aliphaticcarboxylicacids, and mild reaction conditions make this strategy immediately applicable to the synthesis
Aerobic epoxidation of tertiary allylic alcohols remains a significant challenge. Reported here is an efficient and highly chemoselective copper‐catalyzed epoxidation and semipinacol rearrangement reaction of tertiary allylic alcohols with molecular oxygen. The solvent 1,4‐dioxane activates dioxygen, thereby precluding the addition of a sacrificial reductant.