4,5-(1',4'-Butylene)-3-per(poly) fluoroalkylisoxazoles 2 are synthesized by the reaction of the alpha-per(poly) fluoroalkyl cyclohexanones 1 with hydroxylamine hydrochloride in the presence of potassium carbonate under reflux in ethanol. The isomeric 3,4-(1',4'-butylene)-5-per (poly) fluoroalkylisoxazoles 3 can be prepared by a reaction of 1, first with hydroxylamine hydrochloride to give the corresponding oximes 4, followed by the treatment of the resultant reaction mixture with potassium carbonate in a one-pot procedure.
Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones
作者:Xiaolong Su、Honggui Huang、Yaofeng Yuan、Yi Li
DOI:10.1002/anie.201608507
日期:2017.1.24
efficient oxidative radical desulfur‐fragmentation and reconstruction of enoltriflates for the synthesis of α‐CF3 ketones. Preliminary mechanistic studies disclosed that oxidative fragmentation to release a CF3 radical from the triflyl group of enoltriflate and subsequent addition of the CF3 radical to another enoltriflate form the desired α‐CF3 ketones. This method provides a new approach to α‐CF3
Treatment of silyl enol ethers of various carbonylcompounds with Et2Zn and fluoroalkyl halides (Rf–X) in the presence of RhCl(PPh3)3 in DME gave the corresponding α-Rf carbonylcompounds. A highlyreactive alkyl-rhodium complex which was derived from RhCl(PPh3)3 and Et2Zn must be crucial in this reaction by accelerating the reaction rate and improving the yields dramatically. This reaction overcomes
在RhME(PPh 3)3存在下,在DME中用Et 2 Zn和氟代烷基卤化物(R f –X)处理各种羰基化合物的甲硅烷基烯醇醚,得到相应的α- Rf羰基化合物。衍生自RhCl(PPh 3)3和Et 2 Zn的高反应性烷基铑络合物必须通过加快反应速率和显着提高产率来在该反应中发挥关键作用。该反应克服了由于R f –X的反极化而在合成α- Rf羰基化合物时遇到的困难。
A novel synthesis of α-(perfluoroalkyl) ketones
作者:Chang-Ming Hu、Xiao-Qing Tang、Feng-Ling Qing
DOI:10.1016/s0022-1139(00)80336-x
日期:1992.12
Reaction of sodium perhalofluoroalkyl sulfinates with alkenes under UV irradiation and oxygen atmosphere provides α-perhalofluoroalkyl ketones in good yields.