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
Described herein is the anti-Markovnikov iodofluorination of alkenes with Selectfluor/nBu4NI. Selectfluor usually reacts with alkenes through a Markovnikov-type addition. However, the presence of iodide anion leads to a reversed mode. The protocol allows for the construction of tertiary C−F bonds, and features convenient operations, simple reaction conditions, and the installation of an iodine atom
本文描述的是烯烃与 Selectfluor/ n Bu 4 NI的抗马尔科夫尼科夫碘氟化反应。Selectfluor 通常通过马尔科夫尼科夫型加成与烯烃反应。然而,碘化物阴离子的存在导致了反向模式。该协议允许构建三级 C-F 键,具有操作方便、反应条件简单、安装碘原子等特点,为进一步转化提供了可能性。
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.