反应详情

A mixture of 5-methoxy-1-methyl-3-(1-methylethoxy)-1H-indole-2-carboxylic acid (4.0 g, 15 mmol; Unangst PC, et al., J. Med. Chem. 1989;32:1360) and 1,1'-carbonyldiimidazole (2.6 g, 16 mmol) in 75 mL of acetonitrile is stirred at reflux for 2 hours. The mixture is cooled slightly and 75 mL of concentrated ammonium hydroxide is added. After stirring for 15 minutes, the mixture is added to 600 g of ice and water. The precipitated solid is filtered, washed with water, and recrystallized from aqueous acetonitrile to give 2.1 g (53%) of product; mp 147°-149° C.

1. temperatureat reflux for 2 hours
2. temperatureThe mixture is cooled slightly
3. stirringAfter stirring for 15 minutes
4. filtrationThe precipitated solid is filtered
5. washwashed with water
6. customrecrystallized from aqueous acetonitrile