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
tied to the more lipophilic compounds. The most active derivative contained phenylglycine moiety (PC-d/l-Pgl-Me, MIC < 1.95 µg/mL). All active compounds possessed low cytotoxicity and good selectivity towards Mtb. To the best of our knowledge, this is the first study comparing the activities of the d- and l-amino acid derivatives of pyrazinamide as potential antimycobacterial compounds.