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
Facile synthesis and antimycobacterial activity of isoniazid, pyrazinamide and ciprofloxacin derivatives
作者:Shahinda S. R. Alsayed、Shichun Lun、Alan Payne、William R. Bishai、Hendra Gunosewoyo
DOI:10.1111/cbdd.13836
日期:2021.6
(PZA) and ciprofloxacin (CPF) derivatives were conveniently synthesized and evaluated in vitro against H37Rv Mycobacterium tuberculosis (M. tb) strain. CPF derivative 16 displayed a modest activity (MIC = 16 µg/ml) and was docked into the M. tb DNA gyrase. Isoniazid‐pyrazinoic acid (INH‐POA) hybrid 21a showed the highest potency in our study (MIC = 2 µg/ml). It also retained its high activity against