Ethanol → 5-(2-Ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]-7-pyrimidinone

4-(2-Ethoxybenzamido)-1-methyl-3-n-propylpyrazole-5-carboxamide (223 g, 0.676 mol) was added portionwise to a solution of sodium hydroxide (54 g, 1.35 mol) and 30% hydrogen peroxide solution (224 ml) in water (2000 ml). Ethanol (700 ml) was added and the resulting mixture heated under reflux for 2.5 hours, cooled, then evaporated under vacuum. The resulting solid was treated with 2N hydrochloric acid (380 ml), with external cooling, and the mixture was extracted with dichloromethane (1×700 ml, 3×200 ml). The combined organic extracts were washed successively with saturated aqueous sodium carbonate solution (3×400 ml) and brine (300 ml), then dried (Na2SO4) and evaporated under vacuum.

1. temperaturethe resulting mixture heated
2. temperatureunder reflux for 2.5 hours
3. temperaturecooled
4. customevaporated under vacuum
5. additionThe resulting solid was treated with 2N hydrochloric acid (380 ml), with external cooling
6. extractionthe mixture was extracted with dichloromethane (1×700 ml, 3×200 ml)
7. washThe combined organic extracts were washed successively with saturated aqueous sodium carbonate solution (3×400 ml) and brine (300 ml)
8. dry with materialdried (Na2SO4)
9. customevaporated under vacuum

ORD 기록

ord-f17d94ba2eb14a2580b5a6e671194198

출처 데이터셋

uspto-grants-1993_12

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US05272147