Kumar V, Dhawan S, Bala R, Mohite SB, Singh P, Karpoormath R. Cu-catalysed transamidation of unactivated aliphatic amides.
Org Biomol Chem 2022;
20:6931-6940. [PMID:
35983826 DOI:
10.1039/d2ob01152b]
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Abstract
Direct transamidation is gaining prominence as a ground-breaking technique that generates a wide variety of amides without the requirement of acid-amine coupling or other intermediate steps. However, transamidation of unactivated aliphatic amides, on the other hand, has been a long-standing issue in comparison to transamidation of activated amides. Herein, we report a transamidation approach of an unactivated aliphatic amide using a copper catalyst and chlorotrimethylsilane as an additive. In addition, we used transamidation as a tool for selective N-C(O) cleavage and O-C(O) formation to synthesise 2-substituted benzoxazoles and benzothiazoles. The reactions were carried out without using any solvents and offered wide substitution scope.
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