反应详情

温度

25 °C

Aqueous potassium hydroxide (5.93 mL, 10%) was added to ethyl (6-chloro-1-methyl-1H-indazol-3-yl)acetate (Preparation 169, 1.78 g, 0.704 mol) in MeOH (30 mL). The mixture was stirred for 1 hour at 25° C. then the methanol was evaporated in vacuo. The aqueous residue was washed with diethyl ether (30 mL) then acidified with aqueous HCl (6 M). The mixture was extracted with ethyl acetate (30 mL) and the organic phase was dried over sodium sulphate, evaporated in vacuo and purified by column chromatography on silica gel (DCM:MeOH 95:5) to afford the title compound as a white solid in 56% yield, 865 mg.

1. customthe methanol was evaporated in vacuo
2. washThe aqueous residue was washed with diethyl ether (30 mL)
3. extractionThe mixture was extracted with ethyl acetate (30 mL)
4. dry with materialthe organic phase was dried over sodium sulphate
5. customevaporated in vacuo
6. custompurified by column chromatography on silica gel (DCM:MeOH 95:5)