Sequential C−F Bond Transformation of the Difluoromethylene Unit in Perfluoroalkyl Groups: A Combination of Fine‐Tuned Phenothiazine Photoredox Catalyst and Lewis Acid
Ar–nC6F13 and heptafluoroisopropylarenes (Ar–CF(CF3)2) underwent site-selective defluoroallylation. DFT calculation studies revealed that the in situ generated Bu3SnF traps F– to prevent a retroreaction from the unstable perfluoroalkyl radical intermediate, and the radical intermediate favorably reacts with allylic stannanes. The synthesis of a bis(trifluoromethyl)methylene unit containing compound
全氟烷基芳烃的位点选择性和直接 C-F 键转化是通过铱光氧化还原催化剂系统用烯丙基锡烷实现的。本脱氟烯丙基化反应仅在苄基位置通过全氟烷基自由基进行,全氟烷基自由基是从受激光氧化还原催化剂到全氟烷基芳烃的单电子转移产生的。各种全氟烷基都适用:线性全氟烷基取代的芳烃,例如 Ar– n C 4 F 9和 Ar– n C 6 F 13和七氟异丙基芳烃(Ar–CF(CF 3 ) 2)进行了位点选择性脱氟烯丙基化。DFT 计算研究表明,原位生成的 Bu 3 SnF 捕获 F -以防止不稳定的全氟烷基自由基中间体发生逆反应,并且自由基中间体有利于与烯丙基锡烷反应。含双(三氟甲基)亚甲基单元的化合物是一种类似物,可用作预防或治疗糖尿病和炎症性疾病的药物,其合成证明了该反应的实用性。
A class of effective decarboxylative perfluoroalkylating reagents: [(phen)<sub>2</sub>Cu](O<sub>2</sub>CR<sub>F</sub>)
作者:Yangjie Huang、Manjaly J. Ajitha、Kuo-Wei Huang、Zhongxing Zhang、Zhiqiang Weng
DOI:10.1039/c6dt00277c
日期:——
[(phen)2Cu](O2CRF) (1) for the decarboxylative perfluoroalkylation of aryl and heteroaryl halides. Treatment of copper tert-butyloxide with phenanthroline ligands, with subsequent addition of perfluorocarboxylic acids afforded air-stable copper(I) perfluorocarboxylato complexes 1. These complexes reacted with a variety of aryl and heteroaryl halides to form perfluoroalkyl(hetero)arenes in moderate to high
A highly chemoselective perfluoroalkylation reaction of aromatic halides is reported. Thermally stable perfluoroalkylzinc reagents, generated by a rapid halogen–zinc exchange reaction between diorganozinc and perfluoroalkyl halide species, couple with a wide range of aryl halides in the presence of a copper catalyst, in moderate to high yields. Good stability of the perfluoroalkylzinc species was indicated
New Methods of Free-Radical Perfluoroalkylation of Aromatics and Alkenes. Absolute Rate Constants and Partial Rate Factors for the Homolytic Aromatic Substitution by <i>n</i>-Perfluorobutyl Radical
n-C(4)F(9)I has been utilized as source of C(4)F(9)(*) radical through iodine abstraction by phenyl or methyl radical. The reaction with alkenes, carried out in the presence of catalytic amount of Cu(OAc)(2), leads to substitution by a mechanism substantially identical to the aromatic substitution and not to the usual chain addition of perfluoroalkyl group and iodine atom to the double bond. This has