反应详情

温度

120 °C

7.1 A mixture of 14.4 g (157 mmol) of glyoxylic acid monohydrate and 50 ml (464 mmol) of isopropyl methyl ketone is heated at 120° C. with stirring for two hours. The reaction mixture is cooled to 40° C., and 70 ml of water and 12 ml of 32% aqueous ammonia solution are added. This mixture is extracted three times with dichloromethane. 7.55 ml (155 mmol) of hydrazinium hydroxide are added to the aqueous phase, and the mixture is heated at reflux for 18 hours. The reaction mixture is cooled to room temperature and extracted with dichloromethane. The organic phase is dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with petroleum ether/tert-butyl methyl ether as eluent, giving 4-hydroxy-5,5,6-trimethyl-4,5-dihydro-2H-pyridazin-3-one as colourless crystals (ESI 157) and 6-isopropyl-2H-pyridazin-3-one as colourless crystals (ESI 139).

1. temperatureThe reaction mixture is cooled to 40° C.
2. extractionThis mixture is extracted three times with dichloromethane
3. temperaturethe mixture is heated
4. temperatureat reflux for 18 hours
5. temperatureThe reaction mixture is cooled to room temperature
6. extractionextracted with dichloromethane
7. dry with materialThe organic phase is dried over sodium sulfate
8. customevaporated
9. customThe residue is chromatographed on a silica-gel column with petroleum ether/tert-butyl methyl ether as eluent