A safe, simple, and selective method and reagent for deoxyfluorination is disclosed. With the method and reagent disclosed herein, organic compounds such as carboxylic acids, carboxylates, carboxylic acid anhydrides, aldehydes, and alcohols can be fluorinated by using the most common nucleophilic fluorinating reagents and electron deficient fluoroarenes as mediators under mild conditions, giving corresponding fluoroorganic compounds in excellent yield with a wide range of functional group compatibility and easy product purification. For example, directly utilizing KF for deoxyfluorination of carboxylic acids provides the most economical and the safest pathway to access acyl fluorides, key intermediates for syntheses of peptide, amide, ester, and dry fluoride salts.
Deoxyfluorination of Carboxylic Acids with KF and Highly Electron-Deficient Fluoroarenes
作者:Siyu Mao、Jordan H. Kramer、Haoran Sun
DOI:10.1021/acs.joc.0c02491
日期:2021.5.7
A deoxyfluorination reaction of carboxylic acids using potassium fluoride (KF) and highly electron-deficient fluoroarenes is reported here, giving acyl fluorides in moderate to excellent yield (57–92% based on NMR integration and 34–95% for isolated examples).
We describe here a Ni-catalysed deamidative fluorination of diverse amides with electrophilic fluorinating reagents. Different types of amides including aromatic amides and olefinic amides were well compatible, affording the corresponding acyl fluorides in good to excellent yields.
Synthesis of (Hetero)Aroyl Fluorides via a Mild Amides C−N Bond Cleavage
作者:Muhammad Aliyu Idris、Kwang Ho Song、Sunwoo Lee
DOI:10.1002/adsc.202200275
日期:2022.7.19
provide the corresponding acyl fluorides in good yields. The reaction was conducted under environmentally friendly conditions using i-PrOAc as the solvent. Moreover, the reaction was performed at room temperature and did not require a transition-metal catalyst or additives. The methodology showed functional group tolerance toward amines, alkoxy, halides, ketones, esters, and aldehydes.
酰胺,例如N-苯甲酰糖精、 N,N-二苯甲酰胺和N-苯基-N-甲苯磺酰苯甲酰胺与 Et 3 N·3HF 反应以良好的收率提供相应的酰氟。该反应在环境友好的条件下使用i- PrOAc 作为溶剂进行。此外,该反应在室温下进行,不需要过渡金属催化剂或添加剂。该方法显示官能团对胺、烷氧基、卤化物、酮、酯和醛的耐受性。
Exogenous Ligand-Free NiH-Catalyzed Hydroacylation of Aryl Alkenes with Aroyl Fluorides
作者:Jihye Kim、Jieun Jang、Yoonho Lee、Kwangmin Shin
DOI:10.1021/acs.orglett.2c02110
日期:2022.7.29
Acylfluorides have emerged as efficient acyl group donors, but these attractive reagents have rarely been utilized in transition-metal-catalyzed hydroacylation. Herein we report a nickel hydride-catalyzed hydroacylation of aryl alkenes using aroyl fluorides. The reaction proceeds without recourse to an exogenous ligand under mild conditions. The synthetic utility of the present method is demonstrated