反应详情

43.6 g. of (3-phenylpropionyl)malonic acid, diethyl ester (0.15 mol.) are added to a stirred mixture of 16.5 g. of 5-amino-1-ethylpyrazole (0.15 mol.) and 220 g. of polyphosphoric acid. The mixture is heated to 120° (bath temperature) for 50 minutes. After the mixture has cooled to room temperature, 250 ml. of water are added in portions and stirring is continued for 20 minutes. The aqueous phosphoric acid solution is then decanted and the undissolved residue is treated with 200 ml. of water and aqueous ammonia (10%) to neutralize the mixture. The mixture is extracted with chloroform and the chloroform extract is washed twice with water, dried with Na2SO4 and evaporated to yield 39 g. of the oily product. Dissolution of the oil in about 250 ml. of ether and addition of ethereal hydrogen chloride yields 35 g. (62%) of 1-ethyl-4-hydroxy-6-(2-phenylethyl)-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid, ethyl ester, hydrochloride, m.p. 153°-155° (ethanol/ethyl acetate 1:1).

1. temperatureThe mixture is heated to 120° (bath temperature) for 50 minutes
2. customThe aqueous phosphoric acid solution is then decanted
3. additionthe undissolved residue is treated with 200 ml
4. extractionThe mixture is extracted with chloroform
5. extractionthe chloroform extract
6. washis washed twice with water
7. dry with materialdried with Na2SO4
8. customevaporated
9. customto yield 39 g
10. dissolutionDissolution of the oil in about 250 ml
11. customyields 35 g