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
Carboxylic Acid Deoxyfluorination and One-Pot Amide Bond Formation Using Pentafluoropyridine (PFP)
作者:William D. G. Brittain、Steven L. Cobb
DOI:10.1021/acs.orglett.1c01953
日期:2021.8.6
cheap commercially available reagent, in the deoxyfluorination of carboxylicacids to acyl fluorides. The acyl fluorides can be formed from a range of acids under mild conditions. We also demonstrate that PFP can be utilized in a one-pot amide bond formation via in situ generation of acyl fluorides. This one-pot deoxyfluorination amide bond-forming reaction gives ready access to amides in yields of ≤94%
Deoxyfluorination of Carboxylic, Sulfonic, Phosphinic Acids and Phosphine Oxides by Perfluoroalkyl Ether Carboxylic Acids Featuring
<scp>
CF
<sub>2</sub>
O
</scp>
Units
deoxyfluorination of carboxylic, sulfonic, phosphinic acids and phosphine oxides is a fundamentally important approach to access acyl fluorides, sulfonyl fluorides and phosphoric fluorides, thus the development of inexpensive, stable, easy‐to‐handle, versatile, and efficient deoxyfluorination reagents is highly desired. Herein, we report the use of potassium salts of perfluoroalkyl ether carboxylicacids (PFECA)
Facile Synthesis of Alkylidene Phthalides by Rhodium‐Catalyzed Domino C−H Acylation/Annulation of Benzamides with Aliphatic Carboxylic Acids
作者:Sien Liu、Bangyue He、Hongyi Li、Xiaofeng Zhang、Yaping Shang、Weiping Su
DOI:10.1002/chem.202102734
日期:2021.11.11
A Rh-catalyzed domino reaction of 8-aminoquinolin-derived benzamides with aliphaticcarboxylicacids is described. This reaction goes through 8-aminoquinolin-directed C−H acylation of benzamides using acyl fluorides generated by carboxylicacids as carbonyl sources and concomitant conversion of 8-aminoquinoline-derived amide into lactone. This synthetic method exhibited broad substrate scope and excellent
Radical-Mediated Activation of Esters with a Copper/Selectfluor System: Synthesis of Bulky Amides and Peptides
作者:Akira Matsumoto、Zhe Wang、Keiji Maruoka
DOI:10.1021/acs.joc.1c00188
日期:2021.4.2
approach for the activation of esters via a radical-mediated process enabled by a copper/Selectfluor system. A variety of para-methoxybenzyl esters derived from bulky carboxylicacids and amino acids can be easily converted into the corresponding acyl fluorides, directly used in the one-pot synthesis of amides and peptides. As a proof of concept, this method was applied to the iterative formation of sterically