反应详情

温度

60 °C

To a stirred solution of methyl 6-(4-(tert-butoxycarbonyl)piperazin-1-yl)-1-cyclopentyl-1H-indazole-4-carboxylate (2 g, 4.67 mmol) in methanol (20 mL), was added aqueous NaOH solution (0.373 g, dissolved in 10 mL water, 9.34 mmol) and the reaction mixture stirred at 60° C. for 4 h. On completion, ethanol was removed under reduced pressure and the residue acidified with 1N HCl to pH 6. The precipitate was filtered, washed with water and dried to obtain pure 6-(4-(tert-butoxycarbonyl)piperazin-1-yl)-1-cyclopentyl-1H-indazole-4-carboxylic acid (1.7 g, 88%).

1. customOn completion, ethanol was removed under reduced pressure
2. filtrationThe precipitate was filtered
3. washwashed with water
4. customdried