Synthesis 2022; 54(16): 3595-3604
DOI: 10.1055/a-1817-1965
paper

Potassium tert-Butoxide Facilitated Amination of Carboxylic Acids with N,N-Dimethylformamide

Yuanjing Huang
,
Jing Zhang
The National Natural Foundation of China (22071185); The Fundamental Research Funds for the Central Universities (2042019kf0008); Wuhan University startup funding.


Abstract

Herein a practical and efficient potassium tert-butoxide (KO t Bu)-facilitated amination of carboxylic acids with N,N-dimethylamine is described. In the presence of catalytic amount of KO t Bu, a variety of aliphatic and aromatic carboxylic acids are transformed to N,N-dimethylamides using DMF as the dimethylamine reagent with the assistance of trimethylacetic anhydride. The applicability of this protocol is demonstrated by late-stage dimethylamidation of complex drug molecules. A plausible reaction mechanism involving KO t Bu-facilitated in situ amine generation from formamide decomposition and anhydride-mediated condensation is proposed on the basis of mechanistic investigations.

Supporting Information



Publikationsverlauf

Eingereicht: 05. März 2022

Angenommen nach Revision: 03. April 2022

Accepted Manuscript online:
05. April 2022

Artikel online veröffentlicht:
17. Mai 2022

© 2022. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany