Terminal and cyclic alkenes reacted with iodotoluene difluoride and Et3N-5HF to give vic-difluoro products selectively.
端位和环状烯烃与碘甲苯二氟化物和Et3N-5HF反应,选择性地生成邻位二氟化物产物。
Electrochemical Vicinal Difluorination of Alkenes: Scalable and Amenable to Electron‐Rich Substrates
作者:Sayad Doobary、Alexi T. Sedikides、Henry P. Caldora、Darren L. Poole、Alastair J. J. Lennox
DOI:10.1002/anie.201912119
日期:2020.1.13
oxidative difluorination of alkenes represents an important strategy for their preparation, yet current methods are limited in their alkene-types and tolerance of electron-rich, readily oxidized functionalities, as well as in their safety and scalability. Herein, we report a method for the difluorination of a number of unactivated alkene-types that is tolerant of electron-rich functionality, giving products
In the current arsenal of catalytic dihalogenation technologies, the direct generation of the vicinal difluoride moiety from simple olefins without a prefunctionalization step remains conspicuously absent. Herein we report a catalytic, vicinal difluorination of olefins displaying broad functional group tolerance, using inexpensive p-iodotoluene as the catalyst. Preliminary efforts toward the development
iodoarene-catalyzed fluorination reactions as a terminal oxidant is reported. This reaction is effective for the fluorination of simple alkenes, aromatic alkenes and 1,3-dicarbonyl compounds, giving 1,2-difluorinated alkanes, geminal difluorinated compounds, 2-fluorinated-1,3-dicarbonyl compounds in good to high yields, respectively. This is a useful fluorination reaction that not only improves the issues
报道了一种新的 N−F 试剂,N , N '-二氟-2,2'-联吡啶鎓双(四氟硼酸盐),作为末端氧化剂用于碘芳烃催化的氟化反应。该反应可有效氟化简单烯烃、芳香烯烃和1,3-二羰基化合物,分别以良好至高产率生成1,2-二氟化烷烃、偕二氟化化合物、2-氟化-1,3-二羰基化合物。这是一种有用的氟化反应,不仅改善了使用传统 mCPBA 作为末端氧化剂的氟化反应的问题,而且构建了更简单的催化循环。本发明的NF试剂可以作为2,2'-联吡啶回收。
Molecular Iodine as a Catalyst for Alkene Difluorination
The difluorination reaction of alkenes catalyzed by molecular iodine was revealed for the first time. This difluorination reaction affords a simple and practical experimental method and can be applied to many aliphatic and aromatic alkenes bearing synthetically useful functional groups, such as ester, amide, hydroxy, and aryl groups. Preliminary mechanistic studies of this alkene difluorination suggest