such as heteroaromatic N-alky amides and morpholine amide are effectively synthesized, indicating that CeO2 can be a practically useful catalyst. A proposed mechanism includes (1) hydration of nitrile to the primary amide and (2) transamidation of the primary amide with amine as the rate-limiting step. This reaction mechanism provides a reason why the present catalytic system gives high selectivity.
Preparation of Pyrazine Carboxamides: A Reaction Involving <i>N</i>-Heterocyclic Carbene (NHC) Intermediates
作者:Rajasekhar Reddy Naredla、Barada P. Dash、Douglas A. Klumpp
DOI:10.1021/ol402200x
日期:2013.9.20
In the reactions of 2,3-pyrazinedicarboxylic anhydride with amines and anilines, pyrazine carboxamides are formed in good to excellent yields. A mechanism is proposed involving ring opening of the anhydride and decarboxylation of the heterocyclic ring. Based on other similar heterocyclic decarboxylations, this suggests the involvement of an N-heterocyclic carbene intermediate leading to the product
Fe3+-exchanged clay catalyzed transamidation of amides with amines under solvent-free condition
作者:Md. Ayub Ali、S.M.A. Hakim Siddiki、Kenichi Kon、Ken-ichi Shimizu
DOI:10.1016/j.tetlet.2013.12.111
日期:2014.2
Fe3+-exchanged montmorillonite is shown to be an effective and reusable heterogeneous catalyst for the transamidation of various amides and amines under solvent-free condition. The catalyst shows high yields and wide substrate scope. (C) 2014 Elsevier Ltd. All rights reserved.
Optimization of physicochemical properties is a strategy to improve drug-likeness associated with activity: Novel active and selective compounds against Trypanosoma cruzi
作者:Marina T. Varela、Maiara Amaral、Maiara M. Romanelli、Erica V. de Castro Levatti、Andre G. Tempone、João Paulo S. Fernandes