It was found that potassium fluoride-poly(hydrogen fluoride) salts are useful fluorine sources for halofluorination of alkenes. The reaction proceeded with these salts and N-halosuccinimides or 1,3-dibromo-5,5-dimethylhydantoin in a regio- and stereoselective manner.
Halofluorination of Alkenes Using Dilute Hydrofluoric Acid
作者:Manabu Kuroboshi、Tamejiro Hiyama
DOI:10.1246/bcsj.68.1799
日期:1995.7
Iodofluorination of alkenes was achieved with N-iodosuccinimide, potassium hydrogendifluoride, and 1 M hydrofluoric acid using tetrabutylammonium fluoride as a phase-transfer catalyst. The active fluorinating reagent was shown to be tetrabutylammonium dihydrogentrifluoride by preparing the salt in a different way and by effecting the same transformation under anhydrous conditions. Bromofluorination
使用四丁基氟化铵作为相转移催化剂,用 N-碘代琥珀酰亚胺、二氟化氢钾和 1 M 氢氟酸实现烯烃的碘氟化。通过以不同的方式制备盐并在无水条件下进行相同的转化,活性氟化试剂显示为四丁基二氟化氢铵。烯烃的溴氟化也使用 1,3-二溴-5,5-二甲基乙内酰脲进行。用 DBU 处理 I-F 加合物可立体定向地提供氟烯烃。
Selective bromofluorination of alkenes with 1,3-dibromo-5,5-dimethylhydantoin and silicon tetrafluoride
作者:Makoto Shimizu、Yuko Nakahara、Hirosuke Yoshioka
DOI:10.1039/c39890001881
日期:——
Alkenes have been converted into the corresponding bromofluorides by reaction with 1,3-dibromo-5,5-dimethylhydantoin (DBH) and silicontetrafluoride in 1,4-dioxane in a highly regio-, stereo-, and chemo-selective manner.
(Ï-1)-Fluoroalk-(Ï-1)-enoic acids of chain lengths varying between C5 and C15 have been prepared by consecutive bromofluorination and dehydrobromination of either alk-(Ï-1)-enoic acids or alk-(Ï-1)-enyl acetates, in the latter case followed by oxidation. The halogen was found to increase the antimycotic properties of the unsaturated fatty acids, 10-fluoroundec-10-enoic acid exhibiting a particularly strong fungicidal activity.
Halofluorination of alkenes using tetrabutylammonium dihydrogentrifluoride
作者:Manabu Kuroboshi、Tamejiro Hiyama
DOI:10.1016/s0040-4039(00)92048-3
日期:1991.2
Regio-, stereo-, and chemoselective halofluorination of alkenes is achieved using N-haloamides and tetrabutylammonium dihydrogentrifluoride, and the resulting F-I adducts were successfully converted into fluoroalkenes under dehydroiodination with 1,8-diazabicyclo[5.4.0]undec-7-ene.