反应详情

温度

45 °C

Aqueous sodium hydroxide (9.0 liters of a 20% aqueous solution) was added to a stirred suspension of methyl 3-{1-(1,3-benzodioxol-5-yl)-2-[(2-methoxy4-methylphenyl)-sulfonylamino]-2-oxoethyl}-1-methyl-1H-indole-6-carboxylate (from step (b), 5.0 kg) in methanol (25 liters) and demineralised water (20 liters). The suspension was warmed to 45° C. for 1.5 h, cooled to room temperature and diluted with dichloromethane (25 liters). The pH of the aqueous phase was adjusted to 3 with the addition of concentrated hydrochloric acid (7.0 liters) and the phases separated. The organic phase was concentrated to low volume and filtration of the precipitated product gave the subtitle compound as a white crystalline solid (4.5 kg, 92%).

1. temperaturecooled to room temperature
2. customthe phases separated
3. concentrationThe organic phase was concentrated to low volume and filtration of the precipitated product