将全氟烷基基团引入分子中会产生独特的性质,而全氟烷基化试剂起着至关重要的作用。尽管已经开发了各种类型的全氟烷基化试剂,但现有的亲核全氟烷基化试剂存在化学不稳定和结构多样性有限的问题。这项工作旨在通过引入一种新型亲核全氟烷基化试剂4-吡啶基全氟烷基硫醚(4-PySR f )来解决这些挑战,该试剂表现出基于N-硼基吡啶基阴离子的独特的全氟烷基阴离子释放机制化学。在二硼(4) 化合物和醇盐碱存在下,4-PySR f 有效地将全氟烷基转移到各种亲电子试剂上。值得注意的是,与其他已建立的试剂相比,它表现出优异的转移功能化全氟烷基基团、实现分子内全氟烷基化反应以及参与多步骤合成序列的适用性,为合成复杂的氟化分子提供了稳健的策略。这项工作扩大了 N-硼基吡啶基阴离子化学的合成潜力,并拓宽了亲核全氟烷基化反应的范围。
A practical synthesis of aryl tetrafluoroethyl ethers via the improved reaction of phenols with 1,2-dibromotetrafluoroethane
作者:Jianqing Li、Jennifer X. Qiao、Daniel Smith、Bang-Chi Chen、Mark E. Salvati、Jacques Y. Roberge、Balu N. Balasubramanian
DOI:10.1016/j.tetlet.2007.08.065
日期:2007.10
An efficient and practical synthesis of various aryl tetrafluoroethyl ethers by the reaction of phenols with 1,2-dibromotetrafluoroethane and the subsequent reduction with zinc dust was described. The nucleophilic substitution of 1,2-dibromotetrafluoroethane with phenols initiated by bromophilic attack was improved by using Cs2CO3 as a base and DMSO as a solvent.
描述了通过苯酚与1,2-二溴四氟乙烷反应并随后用锌粉还原而有效和实用地合成各种芳基四氟乙基醚的方法。通过使用Cs 2 CO 3作为碱和DMSO作为溶剂,改善了由亲油性攻击引发的苯酚对1,2-二溴四氟乙烷的亲核取代。
Regioselective Fluoroalkylarylation of Enamides Enabled by an Iron-Catalyzed Multicomponent Radical Cross-Coupling Strategy
strategy for the rapid construction and diversification of compounds. In this vein, multicomponent cross-coupling reactions (MC-CCR) can provide an efficient synthetic route to build molecular complexity. In this work, we report the first iron-catalyzed three-component fluoroalkylarylation of enamides via selective formation and trapping of α-amide radicals under mild conditions and fast reaction times
Cobalt‐Catalyzed Allylic Defluorinative Cross‐Electrophile Coupling between 1,1‐Difluoroalkyl Halides and α‐Trifluoromethyl Styrenes
作者:Haiyan Dong、Zhiyang Lin、Chuan Wang
DOI:10.1002/adsc.202300171
日期:——
In this protocol, we apply reductive cobalt catalysis in the allylic defluorinative cross-electrophile coupling reactionbetween 1,1-difluoroalkyl halides and α-trifluoromethyl styrenes. This reaction features broad substrate scope (39 examples), good tolerance of various functionalities, and circumvention of pregenerating organometallics, offering a general synthetic route to prepare diverse organofluorines
time, hetero(aryl) Grignardreagents to promote selective dicarbofunctionalization of enol silyl ethers. From a broader perspective, this work expands the synthetic utility of enol silyl ethers and establishes bisphosphine–iron catalysis as enabling technology capable of orchestrating selective C–C bond formations with short-lived α-silyloxy radicals with practical implications towards sustainable chemical
Nickel/Photo-Cocatalyzed Three-Component Alkyl-Acylation of Aryl-Activated Alkenes
作者:Pei Fan、Zhe Chen、Chuan Wang
DOI:10.1021/acs.orglett.3c03669
日期:2023.12.15
with aldehydes and electron-withdrawing-group-activated alkyl bromides, providing straightforward access to various ketones under mild and ligand-free conditions. The photocatalyst TBADT plays a dual role in activating the acyl C–H bond of aldehydes via hydrogen atom transfer and reducing the C–Br bond of alkyl bromides via single-electron transfer. While the terminal C–C bond is forged through polarity-matched