Rapid and column-free syntheses of acyl fluorides and peptides using <i>ex situ</i> generated thionyl fluoride
作者:Cayo Lee、Brodie J. Thomson、Glenn M. Sammis
DOI:10.1039/d1sc05316g
日期:——
Thionyl fluoride (SOF2) was first isolated in 1896, but there have been less than 10 subsequent reports of its use as a reagent for organic synthesis. This is partly due to a lack of facile, lab-scale methods for its generation. Herein we report a novel protocol for the ex situ generation of SOF2 and subsequent demonstration of its ability to access both aliphatic and aromatic acyl fluorides in 55–98%
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
enzene. Acid fluorides were converted into acylphosphine sulfides and thioesters using diphosphine disulfides and disulfides/triphenylphosphine, respectively. Aryl esters were obtained fromacid fluorides and phenols in the presence of triphenylsilane. Aryl esters, acylphosphine sulfides, and thioesters were also interconverted in the presence of rhodium complexes. These rhodium-catalyzed acyl transfer
Sulfur-Fluoride Exchange (SuFEx)-Mediated Synthesis of Sterically Hindered and Electron-Deficient Secondary and Tertiary Amides via Acyl Fluoride Intermediates
作者:Christopher J. Smedley、Andrew S. Barrow、Christian Spiteri、Marie-Claire Giel、Pallavi Sharma、John E. Moses
DOI:10.1002/chem.201701552
日期:2017.7.26
Amide bond formation is one of the most executed reactions in chemistry and biology. This is largely due to the ubiquity of the amide functional group in biological molecules, natural products and pharmaceutically important drugs. We report here the development of “SuFExAmide”: a new sulfur–fluoride exchange (SuFEx) click chemistry based protocol for the efficient amidation of carboxylic acids via
A highly chemoselective reductive deuteration of acylfluorides to provide α,α-dideuterio alcohols with exquisite levels of deuterium incorporation was developed using SmI2 and D2O as the deuterium source. This method introduces acylfluorides as attractive radical precursors for the generation of reactive acyl-type fluoride ketyls that should find widespread application in many synthetic strategies