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Journal articles
A Straightforward Synthesis of N-Substituted Ureas from Primary Amides
Abstract : A direct and convenient method for the preparation of N-substituted ureas is achieved by treating primary amides with phenyliodine diacetate (PIDA) in the presence of an ammonia source (NH3 or ammonium carbamate) in MeOH. The use of 2,2,2-trifluoroethanol (TFE) as the solvent increases the electrophilicity of the hypervalent iodine species and allows the synthesis of electron-poor carboxamides. This transformation involves a nucleophilic addition of ammonia on the isocyanate intermediate generated in situ by a Hofmann rearrangement of the starting amide.
https://hal-normandie-univ.archives-ouvertes.fr/hal-02569464
Contributor : Madeleine Roux-Merlin Connect in order to contact the contributor
Submitted on : Wednesday, July 21, 2021 - 11:05:48 AM
Last modification on : Tuesday, January 4, 2022 - 5:59:46 AM
Contributor : Madeleine Roux-Merlin Connect in order to contact the contributor
Submitted on : Wednesday, July 21, 2021 - 11:05:48 AM
Last modification on : Tuesday, January 4, 2022 - 5:59:46 AM
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