首次报道,单电子氧化剂(例如CAN或K 2 S 2 O 8)通过简单的作用影响简单的宝石-二氟环丙烷的开环,从而通过该作用提供了高收率的1,3-二溴-2,2-二氟丙烷。在通过引入第一个溴原子开始反应后,以区域特异性的方式,适当地选择条件允许在位置上不仅允许在第二氟丙烷结构中并入第二卤原子,而且可以在二氟丙烷结构的C 1位上掺入羟基或乙酰氨基基团。 C 3位置。
A strategically novel protocol for ring-opening functionalization of aryl gem-difluorocyclopropanes (F2CPs), which allows an expedient construction of CF3-containing architectures via visible-light-promoted F-nucleophilic attack manifold, was disclosed. Single electron oxidation of F2CPs was ascribed as the critical step for the success of this transformation by prompting F-nucleophilic attack, as
Chloride ion-catalyzed generation of difluorocarbene for efficient preparation of gem-difluorinated cyclopropenes and cyclopropanes
作者:Fei Wang、Wei Zhang、Jieming Zhu、Huaifeng Li、Kuo-Wei Huang、Jinbo Hu
DOI:10.1039/c0cc04548a
日期:——
A chloride ion-catalyzed generation of difluorocarbene from a relatively non-toxic and inexpensive precursor, Me(3)SiCF(2)Cl (1), under mild and neutral conditions leads to an efficient preparation of gem-difluorocyclopropenes and difluorocyclopropanes through [2 + 1] cycloaddition reactions with alkynes and alkenes, respectively.
TMSCF
<sub>3</sub>
as a Convenient Source of CF
<sub>2</sub>
=CF
<sub>2</sub>
for Pentafluoroethylation, (Aryloxy)tetrafluoroethylation, and Tetrafluoroethylation
作者:Lingchun Li、Chuanfa Ni、Qiqiang Xie、Mingyou Hu、Fei Wang、Jinbo Hu
DOI:10.1002/anie.201705734
日期:2017.8.7
A new method for the on-site preparation of tetrafluoroethylene (TFE) and a procedure for its efficient use in pentafluoroethylation by fluoride addition were developed by using a simple two-chamber system. The on-site preparation of TFE was accomplished by dimerization of difluorocarbene derived from (trifluoromethyl)trimethylsilane (TMSCF3) under mild conditions. Other fluoroalkylation reactions
Synthesis of gem-Difluorinated Cyclopropanes and Cyclopropenes: Trifluoromethyltrimethylsilane as a Difluorocarbene Source
作者:Fei Wang、Tao Luo、Jinbo Hu、Ying Wang、Hema S. Krishnan、Parag V. Jog、Somesh K. Ganesh、G. K. Surya Prakash、George A. Olah
DOI:10.1002/anie.201101691
日期:2011.7.25
Highly versatile: The Ruppert–Prakash reagent (Me3SiCF3) can be an efficient source of difluorocarbene. By varying the nonmetallic initiator that is used (F− at lower temperatures and I− at higher temperatures), a range of structurally diverse alkenes and alkynes can be converted into the corresponding gem‐difluorinated cyclopropanes and cyclopropenes in good yields (see scheme).
reported for the first time that single-electron oxidants such as CAN or K2S2O8 affected facile ringopening of simple gem-difluorocyclopropanes to afford 1,3-dibromo-2,2-difluoropropanes in good yields by the action of KBr, and the appropriate choice of conditions allowed to incorporate not only second halogen atoms but also hydroxy or acetamido groups at the C1 position in the difluoropropane structures
首次报道,单电子氧化剂(例如CAN或K 2 S 2 O 8)通过简单的作用影响简单的宝石-二氟环丙烷的开环,从而通过该作用提供了高收率的1,3-二溴-2,2-二氟丙烷。在通过引入第一个溴原子开始反应后,以区域特异性的方式,适当地选择条件允许在位置上不仅允许在第二氟丙烷结构中并入第二卤原子,而且可以在二氟丙烷结构的C 1位上掺入羟基或乙酰氨基基团。 C 3位置。