反应详情

Acetic anhydride (2 ml) was dropped into a solution of 2-[4-[2-(benzoxazol-2-ylthio)ethyl]piperazin-1-yl]-N-(2,6-diisopropyl-4-hydroxyphenyl)acetamide (149 mg, 0.3 mmol) in pyridine (1 ml) with ice cooling and the mixture was stirred at room temperature for 3 hours. The reaction solution was neutralized by adding a saturated aqueous solution of sodium bicarbonate thereto and extracted with ethyl acetate. The organic layer was washed with water and a saturated sodium chloride solution successively and dried over sodium sulfate and the solvent was evaporated therefrom. The residue was purified by a silica gel column chromatography (developing solvent, chloroform:methanol=20:1) to provide 166 mg (yield 100%) of the desired compound as colorless needles.

1. extractionextracted with ethyl acetate
2. washThe organic layer was washed with water
3. dry with materiala saturated sodium chloride solution successively and dried over sodium sulfate
4. customthe solvent was evaporated
5. customThe residue was purified by a silica gel column chromatography (developing solvent, chloroform:methanol=20:1)