反应详情

790 mg of 4-bromonitrobenzene, 10 cm3 of water, 646 mg of sodium carbonate and 190 mg of tetrakis(triphenylphosphine)palladium are added to 1 g of N-[6-(4,4,5,5-tetramethyl[1,3,2]dioxaborolan-2-yl)-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide, prepared as described in Example 56, in 50 cm3 of dioxane. The reaction medium is then refluxed for 18 hours and is allowed to return to room temperature, 75 cm3 of ethyl acetate are then added and the organic phase is washed with 2×50 cm3 of distilled water and then with 50 cm3 of saturated aqueous sodium chloride solution. After drying over magnesium sulphate, filtering and concentrating to dryness under reduced pressure (2 kPa; 45° C.), the residue is purified by chromatography under an argon pressure of 50 kPa, on a column of silica gel (particle size 40-60 μm; diameter 2.5 cm), eluting with a cyclohexane/ethyl acetate mixture (80/20 by volume). The fractions containing the expected product are combined and evaporated under reduced pressure (2 kPa; 50° C.). 650 mg of N-[6-(4-nitrophenyl)-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide are obtained in the form of a yellow oil.

1. customprepared
2. temperatureThe reaction medium is then refluxed for 18 hours
3. customto return to room temperature
4. washthe organic phase is washed with 2×50 cm3 of distilled water
5. dry with materialAfter drying over magnesium sulphate
6. filtrationfiltering
7. concentrationconcentrating to dryness under reduced pressure (2 kPa; 45° C.)
8. customthe residue is purified by chromatography under an argon pressure of 50 kPa
9. washon a column of silica gel (particle size 40-60 μm; diameter 2.5 cm), eluting with a cyclohexane/ethyl acetate mixture (80/20 by volume)
10. additionThe fractions containing the expected product
11. customevaporated under reduced pressure (2 kPa; 50° C.)