Direct Access to Acyl Fluorides from Carboxylic Acids Using a Phosphine/Fluoride Deoxyfluorination Reagent System
作者:Socrates B. Munoz、Huong Dang、Xanath Ispizua-Rodriguez、Thomas Mathew、G. K. Surya Prakash
DOI:10.1021/acs.orglett.9b00197
日期:2019.3.15
A fast and simple method for deoxyfluorination of carboxylic acids is presented. The protocol employs commodity chemicals (PPh3, NBS, fluoride), affording products in excellent yields under mild conditions. Acyloxyphosphonium ion, the key reaction intermediate, was identified by NMR spectroscopic methods. Brønsted acidic conditions are essential for efficient C–F bond formation. The protocol displays
提出了一种快速简单的羧酸脱氧氟化方法。该协议使用了商品化学品(PPh 3,NBS,氟化物),在温和条件下可提供高收率的产品。通过NMR光谱法鉴定了关键的反应中间体酰氧基phosph离子。布朗斯台德酸性条件对于有效的CF键形成至关重要。该协议显示出可扩展性,高官能团耐受性,化学选择性和易于纯化的产品。建立了活性药物成分的脱氧氟化作用。