Silver-Catalyzed Decarboxylative Radical Addition/Cyclization of α,α-Difluoroarylacetic Acids with Acrylamides To Synthesize Difluorinated Oxindoles
作者:Yin-Long Li、Ji-Bo Wang、Xue-Lin Wang、Yang Cao、Jun Deng
DOI:10.1002/ejoc.201701248
日期:2017.11.2
silver-catalyzed decarboxylative radical addition/cyclizationreaction of α,α-difluoroarylacetic acids and acrylamides has been disclosed. The method provides a highly attractive approach to synthesize a series of difluorinated oxindoles that contain variousfunctional groups in moderate to good yields under mild conditions. Moreover, experimental studies reveal that the CF2 group of the α,α-difluoroarylacetic
A novel method for the mild photoredox‐mediated tandem radical acylarylation and tandem acylation/semipinacol rearrangement has been developed. The synthesis of highly functionalized ketones bearing all‐carbon α‐ or β‐quaternary centers has been achieved using easily available symmetric aromatic carboxylic anhydrides as the acyl radical source. The method allows for a straightforward introduction of
Simple and abundant carboxylic acids have been used as acyl radical precursor by means of visible‐light photoredoxcatalysis. By the transient generation of a reactive anhydride intermediate, this redox‐neutral approach offers a mild and rapid entry to high‐value heterocyclic compounds without the need of UV irradiation, high temperature, high CO pressure, tin reagents, or peroxides.
Photocatalyst-free hypervalent iodine reagent catalyzed decarboxylative acylarylation of acrylamides with α-oxocarboxylic acids driven by visible-light irradiation
作者:Wangqin Ji、Hui Tan、Min Wang、Pinhua Li、Lei Wang
DOI:10.1039/c5cc08253f
日期:——
A hypervalent iodine (III) reagent catalyzed carbonylarylation of acrylamides with [small alpha]-oxocarboxylic acids driven by visible-light without photoredox catalyst has been developed. The reactions generate the corresponding products in good yields...
Metal-free oxidative tandem coupling of activated alkenes with carbonyl C(sp2)–H bonds and aryl C(sp2)–H bonds using TBHP
作者:Ming-Bo Zhou、Ren-Jie Song、Xuan-Hui Ouyang、Yu Liu、Wen-Ting Wei、Guo-Bo Deng、Jin-Heng Li
DOI:10.1039/c3sc50810b
日期:——
A metal-free oxidative tandem coupling of activatedalkenes with carbonyl C(sp2)–H bonds and arylC(sp2)–H bonds using TBHP is established for the synthesis of 3-(2-oxoethyl)indolin-2-ones. This method allows 1,2-difunctionalization of the C–C double bond in N-arylacrylamides by simultaneous formation of two C(sp2)–C(sp3) bonds.