The discovery of safe, general, and practical procedures to prepare vinyl fluorides from readily available precursors remains a synthetic challenge. The metal‐free hydrofluorination of alkynes constitutes an attractive though elusive strategy for their preparation. Introduced here is an inexpensive and easily handled reagent that enables the development of simple and scalable protocols for the regioselective hydrofluorination of alkynes to access both the E and Z isomers of vinyl fluorides. These reaction conditions were suitable for a diverse collection of alkynes, including several highly functionalized pharmaceutical derivatives. Computational and experimental mechanistic studies support C−F bond formation through vinyl cation intermediates, with the E‐ and Z‐hydrofluorination products forming under kinetic and thermodynamic control, respectively.

中文翻译：

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使用质子四氟硼酸盐作为可调试剂的立体发散炔氢氟化。

发现从容易获得的前体制备氟乙烯的安全、通用和实用的方法仍然是一个合成挑战。炔烃的无金属氢氟化是一种有吸引力但难以捉摸的制备策略。这里介绍的是一种廉价且易于处理的试剂，它能够开发简单且可扩展的方案，用于炔烃的区域选择性氢氟化，以获取 氟乙烯的E和Z异构体。这些反应条件适用于多种炔烃，包括几种高度官能化的药物衍生物。计算和实验机制研究支持通过乙烯基阳离子中间体形成 C-F 键，其中E- 和Z-氢氟化产物分别在动力学和热力学控制下形成。