Diethylzinc-Mediated Radical 1,2-Addition of Alkenes and Alkynes
作者:Xin Li、Songtao He、Qiuling Song
DOI:10.1021/acs.orglett.1c00669
日期:2021.4.16
A novel diethylzinc-mediated radical 1,2-addition of perfluoroalkyl iodides to unactivatedalkenes and alkynes is presented, which demonstrates a novel way to generate an ethyl difluoroacetate radical. This method is highly efficient and gives full conversions of the substrates, high yields of the products, and negligible byproducts and requires no column chromatography purifications. The mild conditions
Free-Radical Bromotrifluoromethylation of Olefin via Single-Electron Oxidation of NaSO<sub>2</sub>CF<sub>3</sub> by NaBrO<sub>3</sub>
作者:Zhong-Quan Liu、Dong Liu
DOI:10.1021/acs.joc.6b02812
日期:2017.2.3
A free-radical bromotrifluoromethylation of olefin by using NaSO2CF3 and NaBrO3 has been achieved. Sodium bromate acts not only as a single-electron oxidant but also as a bromine source. A radical-clock experiment and electron-spin-resonance detection support a radical process.
Radical alkynyltrifluoromethylation of alkenes with actylenic triflones has been achieved. This radical chain reaction is initiated by a catalytic amount of an electron-donor–acceptor complex composed of Togni’s reagent and N-methylmorpholine. This transformation proceeds under exceptionally mild and operationally simple conditions. A variety of alkenes are compatible in this protocol including aliphatic
Photoredox Catalysis Mediated Application of Methyl Fluorosulfonyldifluoroacetate as the CF<sub>2</sub>CO<sub>2</sub>R Radical Source
作者:Wei Yu、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/acs.orglett.6b02580
日期:2016.10.7
A new application of trifluoromethylating reagent, methyl fluorosulfonyldifluoroacetate (FO2SCF2CO2Me, Chen’s reagent), as the carbomethoxydifluoromethylating reagent under visible light photoredox conditions is reported. The visible-light-induced reaction of FO2SCF2CO2Me with unactivated alkenes, styrenes, or heteroarenes affords a variety of carbomethoxydifluoromethylated products.
报道了三氟甲基化试剂,氟磺酰基二氟乙酸甲酯(FO 2 SCF 2 CO 2 Me,Chen氏试剂)在可见光光氧化还原条件下作为羧甲氧基二氟甲基化试剂的新应用。FO 2 SCF 2 CO 2 Me与未活化的烯烃,苯乙烯或杂芳烃的可见光诱导反应产生了多种甲氧基二氟甲基化产物。
Polarity Umpolung Strategy for the Radical Alkylation of Alkenes
Free radical-mediated alkylation of general alkenes is a challenging and largely unmet goal. Herein, we disclose a conceptually novel "polarity umpolung" strategy for radical alkylation of alkenes using a portfolio of easily-accessed, dual-function alkylating reagents. This is achieved by substituting inherently nucleophilic alkyl radicals with electrophilic sulfone-decorated surrogates, thus inverting