反应详情

A solution of methyl 5-bromo-2-(3-ethylureido)isonicotinate (Intermediate 4, 261 g, 865 mmol) and 7N ammonia in methanol (1.7 L) was allowed to stir at room temperature for 3 d. The solid that precipitated was then collected by filtration, rinsed with methanol (2×500 mL), and then dried on a high vacuum pump overnight, yielding 237 g (95%) of 5-bromo-2-(3-ethylureido)isonicotinamide as a smooth white solid.

1. customThe solid that precipitated
2. filtrationwas then collected by filtration
3. washrinsed with methanol (2×500 mL)
4. customdried on a high vacuum pump overnight