Intermolecular Hydropyridylation of Unactivated Alkenes
作者:Xiaoshen Ma、Seth B. Herzon
DOI:10.1021/jacs.6b05271
日期:2016.7.20
A general method for the hydropyridylation of unactivatedalkenes is described. The transformation connects metal-mediated hydrogen atom transfer to alkenes and Minisci addition reactions. The reaction proceeds under mild conditions with high site-selectivities and allows for the construction of tertiary and quaternary centers from simple alkene starting materials.
H-Bonding-promoted radical addition of simple alcohols to unactivated alkenes
作者:Yunfei Tian、Zhong-Quan Liu
DOI:10.1039/c7gc02540h
日期:——
An H-bonding-induced radicaladdition of simple alcohols to unactivated olefins was achieved. It effectively solved the long-standing problems of reactivity and selectivity in this type of reactions. The hydroxyalkylation occurred via site-specific cleavage of the α-hydroxyl-C-H bond in alcohols. This method allows a highly atom-economic, operationally simple and environmentally benign access to diverse
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
A KI-mediated radical anti-Markovnikov addition of simple ketones/esters to unactivated alkenes
作者:Yunfei Tian、Changqing Sun、Ren Xiang Tan、Zhong-Quan Liu
DOI:10.1039/c7gc03745g
日期:——
A KI-mediated radical anti-Markovnikov addition of simple ketones and esters to unactivated alkenes was developed. Through this strategy, a wide range of complex carbonyl compounds can be conveniently synthesized in high selectivities. In addition, this method features high atom-economy and is transition-metal free, operationally simple and environmentally benign.
Scope and limitations of chiral bis(oxazoline) ligands in the copper-catalysed asymmetric cyclopropanation of trisubstituted alkenes
作者:Niels Østergaard、Jakob F Jensen、David Tanner
DOI:10.1016/s0040-4020(01)00583-x
日期:2001.7
A series of derivatives of 3-methyl-2-buten-1-ol has been used to test the scope and limitations of the copper-catalysedasymmetriccyclopropanation of trisubstituted alkenes by ethyl diazoacetate in the presence of C2-symmetric bis(oxazoline) ligands. In the best case, a trans/cis ratio of 91:9, with 92% ee for the major isomer, was obtained from the reaction of the p-methoxybenzoate derivative. The