反应详情

Oxalyl chloride (47.4 g, 369 mmol) was added to a suspension of 5-Bromo-pyrimidine-2-carboxylic acid (50 g, 250 mmol) in dichloromethane (821 ml) at room temperature followed by 1-2 drop of dimethylformamide. The reaction mixture was stirred under nitrogen for 2 hours LCMS in methanol indicated the presence of the methyl ester and some acid. Dimethylformamide (0.2 ml) was added to the reaction mixture. The acid dissolved after 30 minutes. LCMS showed corresponding methyl ester and no starting material peak was observed. The solvent was removed and dried in vacuo to afford the crude 5-Bromo-pyrimidine-2-carbonyl chloride (55 g, 100%).

1. dissolutionThe acid dissolved after 30 minutes
2. customThe solvent was removed
3. customdried in vacuo