An efficient and inexpensive synthesis of N-substituted amides from the Ritter reaction of nitriles with esters catalyzed by Fe(ClO4)3·H2O is described. Fe(ClO4)3·H2O is an economically efficient catalyst for the Ritter reaction under solvent-free conditions. Reactions of a range of esters (benzyl, sec-alkyl, and tert-butyl esters) with nitriles (primary, secondary, tertiary, and aryl nitriles) were
Amide Bond Formation via the Rearrangement of Nitrile Imines Derived from <i>N</i>-2-Nitrophenyl Hydrazonyl Bromides
作者:Mhairi Boyle、Keith Livingstone、Martyn C. Henry、Jessica M. L. Elwood、J. Daniel Lopez-Fernandez、Craig Jamieson
DOI:10.1021/acs.orglett.1c03993
日期:2022.1.14
rearrangement of highly reactive nitrile imines derived from N-2-nitrophenyl hydrazonyl bromides can be harnessed for the facile construction of amide bonds. This amidation reaction was found to be widely applicable to the synthesis of primary, secondary, and tertiaryamides and was used as the key step in the synthesis of the lipid-lowering agent bezafibrate. The orthogonality and functional group tolerance
Functionalized Tetrazoles as Latent Active Esters in the Synthesis of Amide Bonds
作者:Jessica M. L. Elwood、Martyn C. Henry、J. Daniel Lopez-Fernandez、Jenna M. Mowat、Mhairi Boyle、Benjamin Buist、Keith Livingstone、Craig Jamieson
DOI:10.1021/acs.orglett.2c03971
日期:2022.12.30
4-dinitrophenyltetrazoles as latent activeesters (LAEs) in the synthesis of amide bonds. Activating the tetrazole generates an HOBt-type activeester without the requirement for exogenous coupling agents. The methodology was widely applicable to a range of substrates, with up to quantitative yields obtained. The versatility and functional group tolerance were exemplified with the one-step synthesis of various pharmaceutical