We describe a novel reagent system to obtain acyl fluorides directly from three different functional group precursors: carboxylic acids, aldehydes, or alcohols. The transformation is achieved via a combination of trichloroisocyanuric acid and cesium fluoride, which facilitates the synthesis of various acyl fluorides in high yield (up to 99%). It can be applied to the late-stage functionalization of
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).
The highly enantioselective copper-catalyzed three-component boroacylation of 1,1-disubstituted allenes is reported by using a class of chiral ligands (WJ-Phos), delivering various functionalized organoboron compounds bearing an all-carbon stereocenter in moderate to good yields with high enantioselectivities. WJ-Phos is a ferrocene-derived chiral sulfinamide phosphine ligand and can be easily synthesized
Nucleophilic Fluorination Catalyzed by a Cyclometallated Rhodium Complex
作者:Patrick J. Morgan、Graham C. Saunders、Stuart A. Macgregor、Andrew C. Marr、Peter Licence
DOI:10.1021/acs.organomet.2c00052
日期:2022.4.11
Quantitative catalytic nucleophilic fluorination of a range of acyl chlorides to acyl fluorides was promoted by a cyclometallated rhodium complex [(η5,κ2C-C5Me4CH2C6F5CH2NC3H2NMe)- RhCl] (1). 1 can be prepared in high yields from commercially available starting materials using a one-pot method. The catalyst could be separated, regenerated, and reused. Rapid quantitative fluorination generated the fluoride
环金属铑配合物 [(η 5 ,κ 2 CC 5 Me 4 CH 2 C 6 F 5 CH 2 NC 3 H 2 NMe)- RhCl] ( 1 )。 1可以使用一锅法由市售起始原料以高产率制备。催化剂可以分离、再生和重复使用。快速定量氟化生成活性药物成分丙磺舒的氟化物类似物。红外原位监测验证了基材到产品的清洁转化。 VTNA 图解动力学分析和 DFT 计算得出了涉及亲核 Rh-F 键的假定反应机制。