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Updated: May 14, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
XtalFluor-E, an efficient coupling reagent for amidation of carboxylic acids
Aurélie Orliac1, Domingo Gomez Pardo, Agnès Bombrun
1Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
XtalFluor-E efficiently converts carboxylic acids and amines into amides, even for challenging substrates. This method preserves the stereochemical integrity of optically active starting materials, avoiding epimerization or racemization.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Amide bond formation is a fundamental transformation in organic synthesis.
- Traditional methods often require harsh conditions or specialized reagents.
- Developing mild and efficient amidation protocols remains an active area of research.
Purpose of the Study:
- To introduce a novel and effective method for amide synthesis.
- To demonstrate the utility of XtalFluor-E as an activator in amidation reactions.
- To showcase the method's compatibility with sensitive, optically active substrates.
Main Methods:
- Amide synthesis utilizing carboxylic acids and amines.
- Employing XtalFluor-E as a coupling activator.
- Reaction optimization to determine suitable conditions.
Main Results:
- Successful synthesis of amides from various carboxylic acids and amines.
- Demonstrated efficacy with poorly reactive carboxylic acids.
- Preservation of stereochemical integrity (no epimerization/racemization) of chiral amines and carboxylic acids.
Conclusions:
- XtalFluor-E provides a mild and efficient activation strategy for amide bond formation.
- The developed method is suitable for synthesizing amides from a wide range of precursors, including challenging ones.
- This protocol is valuable for applications requiring the retention of stereochemistry in complex molecules.
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