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