反应详情

A mixture of 3-aminopyrazine carboxylic acid (7.0 g, 50.32 mmol), methylene chloride (60 mL), dimethylformamide (40 mL), 4-dimethylaminopyridine (15.37 g, 126 mmol), 2-chloroaniline (5.82 mL, 55.35 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (11.58 g, 60.38 mmol) was stirred overnight at ambient temperature. The solvent was removed and the residue was mixed with ethyl acetate and 1 N lithium chloride. The precipitate which formed was filtered and rinsed with 1 N lithium chloride, ethyl acetate, and ether and then air dried to afford 6.22 g (50%) of 3-aminopyrazine-2-carboxylic acid 2-chlorophenylamide as fluffy yellow crystals.

1. customThe solvent was removed
2. additionthe residue was mixed with ethyl acetate and 1 N lithium chloride
3. customThe precipitate which formed
4. filtrationwas filtered
5. washrinsed with 1 N lithium chloride, ethyl acetate, and ether
6. customair dried