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 carboxylicacids 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
Gram-Scale Preparation of Acyl Fluorides and Their Reactions with Hindered Nucleophiles
作者:Michał Barbasiewicz、Michał Tryniszewski
DOI:10.1055/a-1649-5460
日期:2022.3
A series of acyl fluorides was synthesized at 100 mmol scale using phase-transfer-catalyzed halogen exchange between acyl chlorides and aqueous bifluoride solution. The convenient procedure consists of vigorous stirring of the biphasic mixture at room temperature, followed by extraction and distillation. Isolated acyl fluorides (usually 7–20 g) display excellent purity and can be transformed into sterically
A Convenient, One-Pot Procedure for the Preparation of Acyl and Sulfonyl Fluorides Using Cl3CCN, Ph3P, and TBAF(t-BuOH)4
作者:Doo Jang、Joong-Gon Kim
DOI:10.1055/s-0030-1259051
日期:2010.12
Various carboxylic acids were converted into acyl fluorides in excellent yields by treatment with trichloroacetonitrile, triphenylphosphine, and TBAF(t-BuOH) 4 at room temperature. The reaction was applicable to the preparation of acid-sensitive amino acid fluorides without deprotection or rearrangement.
Stereospecific Alkene Aziridination Using a Bifunctional Amino-Reagent: An Aza-Prilezhaev Reaction
作者:Joshua J. Farndon、Tom A. Young、John F. Bower
DOI:10.1021/jacs.8b10485
日期:2018.12.26
deprotection (TFA) of O-Ts activated N-Boc hydroxylamines triggers intramolecular aziridination of N-tethered alkenes to provide complex N-heterocyclic ring systems. Synthetic and computational studies corroborate a diastereospecific aza-Prilezhaev-type mechanism. The feasibility of related intermolecular alkene aziridinations is also demonstrated.
Synthesis of Acyl Fluorides from Carboxylic Acids Using NaF-Assisted Deoxofluorination with XtalFluor-E
作者:Marie Gonay、Chloé Batisse、Jean-François Paquin
DOI:10.1021/acs.joc.0c01377
日期:2020.8.7
The synthesis of acyl fluorides using the deoxofluorination reaction of carboxylicacids using XtalFluor-E is described. This transformation, assisted by a catalytic amount of NaF, occurs at roomtemperature in EtOAc, where XtalFluor-E behaves as the activating agent and the fluoride source. A wide range of acyl fluorides were obtained in moderate to excellent yields (36–99%) after a simple filtration