Thermal cyclopropyl—allyl rearrangement of gem-chlorofluorocyclopropanes under gas-phase pyrolysis conditions. Formation of chlorofluoroalkenes and 2-fluorobuta-1,3-dienes
作者:N. V. Volchkov、M. B. Lipkind、O. M. Nefedov
DOI:10.1007/s11172-019-2567-3
日期:2019.7
The gas-phase pyrolysis of isomeric 2-chloro-2-fluoro-1-phenylcyclopropanes in a flow reactor at 250–430 °С gives 1-phenyl- and 3-phenyl-3-chloro-2-fluoropropenes. Under similar conditions, methyl-substituted gem-chlorofluorocyclopropanes undergo cyclopropyl—allyl isomerization accompanied by dehydrochlorination to form chlorofluoroalkenes and 2-fluoro-buta-1,3-dienes.
异构 2-氯-2-氟-1-苯基环丙烷在流动反应器中于 250–430 °C 的气相热解得到 1-苯基-和 3-苯基-3-氯-2-氟丙烯。在类似条件下,甲基取代的偕-氯氟环丙烷发生环丙基-烯丙基异构化,并伴随脱氯化氢反应形成氯氟烯烃和 2-氟-丁-1,3-二烯。
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
CuCl-Catalyzed Isomerization of gem-Chlorofluoro-Cyclopropanes into Chlorofluoroalkenes
作者:Nikolai V. Volchkov、Maksim A. Novikov、Mariya B. Lipkind、Oleg M. Nefedov
DOI:10.1016/j.mencom.2013.01.006
日期:2013.1
CuCl-catalyzed isomerization of gem-chlorofluorocyclopropanes into chlorofluoroalkenes occurs as a result of the ring opening accompanied by the migration of chlorine atom. In the case of vinyl- or cyclopropyl-containing substrates, chlorofluoroalkadienes are formed.
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
(2-Fluoroallyl)boronates: new reagents for diastereoselective 2-fluoroallylboration of aldehydes
作者:Maxim A. Novikov、Oleg M. Nefedov
DOI:10.1039/c8ob01103f
日期:——
[(2-MeAll)Pd(IPr)Cl] was developed to afford (2-fluoroallyl)pinacolboronates with high Z-selectivity. The products proved to be useful for anti-selective 2-fluoroallylboration of aromatic and aliphatic aldehydes.