反应详情

To a mixture of 1-benzyl-3-iodo-4-nitro-1H-indazole (304 mg, 0.802 mmol) (prepared as in Example 1, steps E-F) and 1,1′-Bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (196 mg, 0.241 mmol) in dioxane (4.0 mL) under an atmosphere of dry nitrogen was added a solution of diethylzinc (1.6 mL, 1.60 mmol; 1 molar in hexane) with magnetic stirring. The mixture was heated at reflux for 2 hours. After allowing to cool methanol (1 mL) was added followed by dichloromethane (30 mL) and the mixture was stirred for 30 minutes. The mixture was transferred to a separatory funnel and washed with water (30 mL). The organic phase was dried over magnesium sulfate, filtered and concentrated under vacuum. The crude product was purified by column chromatography on silica, eluting with 15-20% ethyl acetate in hexanes. Fractions containing product were concentrated under reduced pressure to give 1-benzyl-3-ethyl-4-nitro-1H-indazole (46 mg).

1. temperatureThe mixture was heated
2. temperatureat reflux for 2 hours
3. additionwas added
4. customThe mixture was transferred to a separatory funnel
5. washwashed with water (30 mL)
6. dry with materialThe organic phase was dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated under vacuum
9. customThe crude product was purified by column chromatography on silica
10. washeluting with 15-20% ethyl acetate in hexanes
11. additionFractions containing product
12. concentrationwere concentrated under reduced pressure