Copper-catalyzed ligand free ring-opening amination of gem-fluorohalocyclopropanes – An efficient route toward 2-fluoroallylamines
作者:Maxim A. Novikov、Yaroslav A. Ibatov、Nikolai V. Volchkov、Maria B. Lipkind、Sergei E. Semenov、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2017.01.001
日期:2017.2
Ring-opening amination of gem-chlorofluoro- and gem-bromofluorocyclopropanes with secondary alkyl, arylamines or hydroxylamines catalyzed by copper(I) or copper(II) compounds with no additional ligands affords tertiary 2-fluoroallylamines or hydroxylamines in moderate to excellent yields. The reaction pathway involves isomerization of gem-fluorohalocyclopropanes to 2-fluoroallyl halides followed by
(NHC)AgCl catalyzed bromofluorocyclopropanation of alkenes with CFBr2CO2Na
作者:Anastasia A. Andrianova、Yulia D. Maslova、Maxim A. Novikov、Sergei E. Semenov、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2018.02.001
日期:2018.5
(monoalkyl substituted), electron-poor (haloalkenes, allylic esters, α,β-unsaturated esters) and acid/base sensitive silyl- and boronyl substituted alkenes with CFBr2CO2Na and catalytic (IPr)AgCl or (SIPr)AgCl was developed.
有效的富氟(芳基取代),电子中性(单烷基取代),贫电子(卤代烯烃,烯丙基酯,α,β-不饱和酯)和酸/碱敏感的甲硅烷基和硼烷基取代的烯烃溴氟环丙烷化的有效方法开发了CFBr 2 CO 2 Na和催化(IPr)AgCl或(SIPr)AgCl。
Copper(I)-catalyzed solvolysis of gem-chlorofluoro- and gem-bromofluorocyclopropanes. Preparation of 2-fluoroallylic ethers, esters and alcohols
作者:Maxim A. Novikov、Nikolai V. Volchkov、Maria B. Lipkind、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2015.09.001
日期:2015.12
Copper(I)-catalyzed solvolysis of gem-chlorofluoro- and gem-bromofluorocyclopropanes in MeOH, NaOAc/AcOH, NaOAc/DMF, HCO2Na/HCO2H or water/dioxane affords 2-fluoroallylic ethers, esters or alcohols in moderate to excellent yields. The reaction pathway involves isomerization of gem-fluorohalocyclopropanes to 2-fluoroallylic halides followed by nucleophilic substitution of a halide onto an O-nucleophile
<i>gem</i>-Halofluorocyclopropanes via [2 + 1] Cycloadditions of In Situ Generated CFX Carbene with Alkenes
作者:Colby Barrett、Vinayak Krishnamurti、Xanath Ispizua-Rodriguez、Ziyue Zhu、Christopher J. Koch、G. K. Surya Prakash
DOI:10.1021/acs.orglett.2c02126
日期:2022.7.29
developed. The method employs ethyl dibromofluoroacetate (EDBFA) as an accessible and inexpensive source of the bromofluorocarbene (:CFBr) intermediate. The protocol provides the bromofluorocyclopropane products in excellent yields, including examples synthesized in multigram scales. The chlorinated ester, ethyl dichlorofluoroacetate (EDCFA), is also utilized to make the analogous gem-chlorofluorocyclopropanes