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
Phenyl(fluorodibromomethyl)mercury has been prepared by reaction of fluorodibromomethane, phenylmercuric chloride and sodium methoxide or potassium tert-butoxide in THF at low temperature. This organomercury reagent is an excellent source of fluorobromocarbene, releasing CFBr within 20 min at 80° or within 4 days at room temperature. The addition of PhHgCFBr2-derived CFBr to the CC bond of 10 olefins
苯基(氟二溴甲基)汞是通过氟二溴甲烷,苯基氯化汞与甲醇钠或叔丁醇钾在THF中在低温下反应制得的。这种有机汞试剂是氟溴卡宾的极好来源,可在80°C下20分钟内或在室温下4天内释放CFBr。描述了将PhHgCFBr 2衍生的CFBr添加到10个烯烃的CC键和(CF 2 Cl)2 CO的CO键中,以及将CFBr插入三乙基硅烷的SiH键中。的Et还原3用三正丁基锡氢化物SiCHFBr得到的Et 3 SICH 2 F.