反应详情

To 4-hydroxybenzoic acid (1.06 g) is added successively methylene chloride (30 mL), 1-(3-ethoxybenzyl)-4-piperazin-1-yl-1H-pyrazolo[3,4-d]pyrimidine dihydrochloride (3.02 g), 1-hydroxybenzotriazole (1.25 g), triethylamine (3.7 mL) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (1.78 g). The mixture is stirred at room temperature for 17 hours. The reaction mixture is diluted with chloroform and thereto is added a saturated sodium hydrogencarbonate solution. After stirring, the organic layer is separated and evaporated to remove solvent. The resultant residue is purified by flash column chromatography on silica gel (Solvent; chloroform:methanol=50:1) to give 1-(3-ethoxybenzyl)-4-[4-(4-hydroxybenzoyl)piperazin-1-yl]-1H-pyrazolo[3,4-d]pyrimidine (2.70 g, yield; 80%) as an amorphous powder. MS (APCI) m/z: 459 [M+H]+

1. stirringAfter stirring
2. customthe organic layer is separated
3. customevaporated
4. customto remove solvent
5. customThe resultant residue is purified by flash column chromatography on silica gel (Solvent; chloroform:methanol=50:1)