反应详情

Methyl 2-oxo-2,3-dihydro-1H-benzimidazole-6-carboxylate (43 g, 0.22 mol) was charged into phosphorus oxychloride (286 ml). Dry hydrogen chloride was bubbled through the boiling reaction mass for 12 hours. After cooling reaction mass was poured in mixture of ice and water (2 kg). Precipitate was filtered out. Filtrate was diluted with water (1.25 litres) and ammonia solution (˜800 ml). After that pH was adjusted to 5.6 with ammonia solution. Precipitate was filtered and rinsed with water. Yield 39.5 g (84%).

1. customDry hydrogen chloride was bubbled through the boiling reaction mass for 12 hours
2. temperatureAfter cooling
3. customreaction mass
4. filtrationPrecipitate was filtered out
5. additionFiltrate was diluted with water (1.25 litres) and ammonia solution (˜800 ml)
6. filtrationPrecipitate was filtered
7. washrinsed with water