The generation of a carbanion from 2-methylpyrazine by phase-transfer
catalysis and its autooxidation to pyrazinecarboxylic acid have been s
tudied. This acid is the starting material for the effective antituber
cular agent pyrazinamide. Optimum conditions were found for the synthe
sis of pyrazinecarboxylic acid. Molecular oxygen, the cheapest and mos
t ecological agent, was used as oxidizing agent.