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
Three-component difluoroalkylamination of alkenes mediated by photoredox and iron cooperative catalysis
作者:Rui Xu、Chun Cai
DOI:10.1039/c9ob01815h
日期:——
A three-component difluoroalkylamination of alkenes with BrCF2CO2Et and amines mediated by visible-lightphotoredox and iron cooperative catalysis is described. Electron rich, electron poor, and internal styrenes are all tolerated giving the desired products in good yields. The Csp3-Csp3 and Csp3-N bonds are simultaneously formed under mild conditions. A radical pathway is proposed by experimental
Copper-Catalyzed Decarboxylative Difluoroalkylation and Perfluoroalkylation of α,β-Unsaturated Carboxylic Acids
作者:Yin-Long Lai、Dian-Zhao Lin、Jing-Mei Huang
DOI:10.1021/acs.joc.6b02613
日期:2017.1.6
Copper-catalyzed decarboxylative difluoroalkylation and perfluoroalkylation of α,β-unsaturatedcarboxylicacids is described. Promoted by dialkyl phosphite, this novel reaction affords fluoroalkylated motifs with excellent stereoselectivity and broad substrate scope under mild reaction conditions from readily available fluoroalkyl iodides and bromides. Preliminary mechanism study suggests that radical
Copper-Catalyzed C(sp<sup>2</sup>)–H Difluoroalkylation of Aldehyde Derived Hydrazones with Diboron as Reductant
作者:Miaolin Ke、Qiuling Song
DOI:10.1021/acs.joc.6b00324
日期:2016.5.6
An efficient and general method for C(sp2)–Hdifluoroalkylation of aldehyde derived hydrazones via a CuII/B2pin2-catalyzed reaction between difluoroalkylbromides and hydrazones was developed. In this reaction, both aromatic and aliphatic difluoroalkylated aldehyde derived hydrazones could be achieved in good to excellent yields. For some heteroaromatic aldehyde derived hydrazones, two fluoroacetates
通过Cu II / B 2 pin 2催化的二氟烷基溴与的反应,开发了一种有效且通用的醛衍生的C(sp 2)-H二氟烷基化方法。在该反应中,芳族和脂族二氟烷基化醛衍生的azo均可以良好至优异的产率获得。对于某些杂芳族醛衍生的azo,可以将两种氟乙酸酯引入最终产物中。初步的机理研究表明,通过SET途径的二氟烷基自由基参与了反应。另外,催化二硼试剂在该转化中起着不可或缺的作用。
Gold-Catalyzed Highly Selective Photoredox C(sp<sup>2</sup>
)−H Difluoroalkylation and Perfluoroalkylation of Hydrazones
作者:Jin Xie、Tuo Zhang、Fei Chen、Nina Mehrkens、Frank Rominger、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201508622
日期:2016.2.18
hydrazones are highly functionalized, versatile molecules. A mild reduction of the coupling products can efficiently produce gem‐difluoromethylated β‐amino phosphonic acids and β‐amino acid derivatives. In mechanistic studies, a difluoroalkyl radical intermediate was detected by an EPR spin‐trappingexperiment, indicating that a gold‐catalyzed radical pathway is operating.
据报道,使用容易获得的R F -Br试剂,gold的金催化光氧化还原C(sp 2)-H二氟烷基化和hydr的全氟烷基化。所得的宝石二氟甲基化和全氟烷基化的azo是高度官能化的多用途分子。偶合产物的轻度减少可以有效地生产出宝石-二氟甲基化的β-氨基膦酸和β-氨基酸衍生物。在机理研究中,通过EPR自旋捕获实验检测到二氟烷基自由基中间体,表明金催化的自由基途径正在起作用。