反应详情

An amount of 194 mg (0.384 mmol) of N-tert-butyl-4-{[3-(4-chlorophenyl)-5-oxo-4-prop-2-en-1-yl-4,5-dihydro-1H-1,2,4-triazol-1-yl]sulphonyl}-3-methoxybenzenecarboxamide from Example 1 was dissolved under argon in 2 ml of degassed dioxane and admixed with 18 mg (0.015 mmol) of tetrakis(triphenylphosphine)palladium(0), 29 μl (0.77 mmol) of formic acid and 134 μl (0.96 mmol) of triethylamine. The mixture was stirred under reflux for 2 h. The dioxane was concentrated on a rotary evaporator and the residue in the flask was taken up in methanol. It was filtered over kieselguhr, the solid product was washed with methanol and the solvent was removed on a rotary evaporator. Ethyl acetate was added to the residue in the flask. Washing with water was carried out twice. The organic phase was dried over sodium sulphate and freed from the solvent on a rotary evaporator. Purification of the residue by flash chromatography on silica gel (solvent gradient cyclohexane/ethyl acetate 1:1 to ethyl acetate 100%) gave 152 mg (85% of theory) of the target compound.

1. temperatureunder reflux for 2 h
2. concentrationThe dioxane was concentrated on a rotary evaporator
3. filtrationIt was filtered over kieselguhr
4. washthe solid product was washed with methanol
5. customthe solvent was removed on a rotary evaporator
6. additionEthyl acetate was added to the residue in the flask
7. washWashing with water
8. dry with materialThe organic phase was dried over sodium sulphate
9. customfreed from the solvent on a rotary evaporator
10. customPurification of the residue by flash chromatography on silica gel (solvent gradient cyclohexane/ethyl acetate 1:1 to ethyl acetate 100%)
11. customgave 152 mg (85% of theory) of the target compound