Selective Halofluorination of Alkenes with Tetrabutylphosphonium Dihydrogentrifluoride in Combination with<i>N</i>-Halosuccinimide or 1,3-Dibromo-5,5-dimethylhydantoin
Alkenes and their functionalized derivatives were readily converted to the corresponding halofluorides with tetrabutylphosphonium dihydrogentrifluoride as combined with N-halosuccinimides or 1,3-dibromo-5,5-dimethylhydantoin in highly regio-, stereo-, and chemoselective manners. In particular, alkenes having a oxirane or primary hydroxyl group also underwent halofluorination selectively in good yields
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。
Polymers as Reagents and Catalysts. XI. Stereospecific Iodofluorination of Alkenes in the Presence of Polymer Supported Hydrogen Fluoride
作者:Ana Gregorcic、Marko Zupan
DOI:10.1246/bcsj.60.3083
日期:1987.8
N-Iodosuccinimide reacted with phenyl substituted alkenes in the presence of insoluble polymer supported hydrogenfluoride, which was prepared by reaction of hydrogenfluoride with crosslinked poly(styrene-co-4-vinylpyridine) containing 40–45 mol% of 4-vinylpyridine, thus forming vicinal iodofluorides in high yields. Reactions proceeded with Markovnikov type regioselectivity, and in the case of (Z)-