Rhenium-catalyzed dehydrogenative olefination of C(sp<sup>3</sup>)–H bonds with hypervalent iodine(<scp>iii</scp>) reagents
作者:Haidong Gu、Congyang Wang
DOI:10.1039/c5ob00619h
日期:——
dehydrogenative olefination of C(sp3)–H bonds is disclosed here, by merging rhenium catalysis with an alanine-derived hypervalentiodine(III) reagent. Thus, cyclic and acyclic ethers, toluene derivatives, cycloalkanes, and nitriles are all successfully alkenylated in a regio- and stereoselective manner.
Nickel-Catalyzed Benzylation of Aryl Alkenes with Benzylamines via C–N Bond Activation
作者:Hui Yu、Bin Hu、Hanmin Huang
DOI:10.1021/acs.joc.8b02279
日期:2018.11.16
example of nickel-catalyzed Heck-type benzylation of aryl olefins with various benzylamines as benzyl electrophiles, and the benzylic C–N bond cleavage was efficiently promoted by the amine–I2 charge transfer complex (CT complex). The combination of low-cost NiCl2 and I2 has been found to facilitate Heck reaction of tertiary benzylamines and alkenes into various benzyl-substituted alkenes in good to
Oxo-Rhenium-Catalyzed Radical Addition of Benzylic Alcohols to Olefins
作者:Chandrasekhar Bandari、Kenneth M. Nicholas
DOI:10.1021/acs.joc.9b03150
日期:2020.3.6
Although carbon radicals generated from a variety of alcohol derivatives have proven valuable in coupling and addition reactions, the direct use of alcohols as synthetically useful radical sources is less known. In this report, benzylic alcohols are shown to be effective radical precursors for addition reactions to alkenes when treated with triphenylphosphine or piperidine with the catalyst ReIO2(PPh3)2 (I)
Transition metal-free reductive coupling of allylic sulfonylhydrazones with aryl boronic acids for C(sp<sup>3</sup>)–C(sp<sup>2</sup>) bond formation
作者:Kasim Ali、Gurudayal Prajapati、Ravi Sankar Ampapathi、Gautam Panda
DOI:10.1039/d2ob01472f
日期:——
The reductive coupling between allylic sulfonylhydrazones and aryl boronic acids gives 1,3-diarylpropene systems with good to excellent yields. Simple reaction conditions, high yields, and good functional group tolerance are the salient features of this reaction which takes place without using any transition-metal catalysts and an inert atmosphere. The substituents on aryl boronic acid or allylic sulfonylhydrazone