Preparation of β-bromodifluoromethyl-functionalized esters, nitrile and ketones via addition of dibromodifluoromethane to electron-deficient alkenes initiated by a CrCl3/Fe bimetal redox system
A Copper(I)-Catalyzed Radical-Relay Reaction Enabling the Intermolecular 1,2-Alkylborylation of Unactivated Olefins
作者:Sota Akiyama、Natsuki Oyama、Tsubura Endo、Koji Kubota、Hajime Ito
DOI:10.1021/jacs.1c02050
日期:2021.4.7
2-alkylborylation reaction via a radical-relay mechanism between unactivated olefins, bis(pinacolato)diboron, and an alkyl electrophile is reported. Successful implementation of this method requires that the competing boryl substitution of the alkyl electrophile is retarded to facilitate the radical relay. This challenge was overcome using electronically or sterically demanding alkyl electrophiles, which results
Stereocontrolled generation of nucleophilic (Z)- or (E)-α-fluoroalkenylchromium reagents via carbon–fluorine bond activation: highly stereoselective synthesis of (E)- or (Z)-β-fluoroallylic alcohols
Highly nucleophilic (Z)- or (E)-alpha-fluoroalkenylchromium species could be generated in a stereoselective manner via C-F bond activation of CBrF2-containing molecules, and they reacted smoothly with various aldehydes to give (E)- or (Z)-beta-fluoroallylic alcohol derivatives in high yields, respectively.
Highly Stereoselective Synthesis of Fluoroalkene Dipeptides via the Novel Chromium(II)-Mediated Carbon–Fluorine Bond Cleavage/New Carbon–Carbon Bond Formation
the novel reductivecoupling, four types of fluoroalkene dipeptide analogues could be stereoselectively prepared. An efficient chromium(II)-mediated reductivecoupling reaction of various CBrF2-containing molecules and aldehydes has been developed. This reaction proceeds presumably via the monofluorinated dichromium(III) intermediate generated by the carbon–fluorine bond activation, and provides a