Electrophilic Vinylation of Thiols under Mild and Transition Metal‐Free Conditions
作者:Laura Castoldi、Ester Maria Di Tommaso、Marcus Reitti、Barbara Gräfen、Berit Olofsson
DOI:10.1002/anie.202002936
日期:2020.9
methodology displays high functional group tolerance and proceeds under mild and transition metal‐free conditions without the need for excess substrate or reagents. Mercaptothiazoles could be vinylated under modified conditions, resulting in opposite stereoselectivity compared to previous reactions with vinyliodonium salts. Novel VBX reagents with substituted benziodoxolonecores were prepared, and improved
copper(I)-catalyzed vinylation of diazo compounds with vinylbenziodoxolone reagents (VBX) as partners is reported. The transformation tolerates diversefunctionalities on both reagents delivering polyfunctionalized vinylated products. The strategy was successfully extended to a three-component/intermolecular version with alcohols. The obtained products contain synthetically versatile functional groups, such
A novel regio‐ and diastereoselective iron‐catalyzed intermolecular oxyazidation of enamidesusing various azidobenziodoxolone (ABX) derivatives is presented. A variety of α‐N3 amino derivatives and of α‐N3 piperidines were synthesized in good yields and under mild reaction conditions. The reaction involves a radical process using cheap FeCl2 as the initiator.
Access to Vinyl Ethers and Ketones with Hypervalent Iodine Reagents as Oxy‐Allyl Cation Synthetic Equivalents
作者:Nina Declas、Jerome Waser
DOI:10.1002/ange.202006707
日期:2020.10.5
use of hypervalent iodine reagents. Under mild basic conditions, the addition of nucleophiles to aryloxy‐substituted vinylbenziodoxolone (VBX) reagents, easily available in two steps from silyl alkynes, resulted in the stereoselective formation of substituted aryl enol ethers. The reaction was most efficient with phenols as nucleophiles, but preliminary results were also achieved for C‐ and N‐ nucleophiles
Transition metal-free and regioselective vinylation of phosphine oxides and <i>H</i>-phosphinates with VBX reagents
作者:Laura Castoldi、Adam A. Rajkiewicz、Berit Olofsson
DOI:10.1039/d0cc05992g
日期:——
Vinylbenziodoxolones (VBX) were demonstrated as efficient, metal-free P-vinylation reagents with complete regioselectivity in favor of the terminal alkenes.