反应详情

温度

130 °C

1-(2-Chloro-4,6-dimethylphenyl)-2-methylsulfanyl-1,4,5,6-tetrahydropyridine-3-carboxylic acid methyl ester (4.99 g), methylhydrazine (16.4 mL), p-toluenesulfonic acid monohydrate (2.91 g), and methanol (75 mL) were combined in a glass vessel sealed with a Telfon™ screw cap. The reaction mixture was stirred in a 130° C. oil bath for 24 h, then cooled to room temperature and concentrated on the rotary evaporator. The residue was chromatographed on silica gel using a methanol/dichloromethane gradient to give 3.21 g of 7-(2-chloro-4,6-dimethylphenyl)-2-methyl-1,2,4,5,6,7-hexahydropyrazolo-[3,4-b]pyridin-3-one, mp 95.9–99.9° C.

1. customsealed with a Telfon™
2. customscrew cap
3. temperaturecooled to room temperature
4. concentrationconcentrated on the rotary evaporator
5. customThe residue was chromatographed on silica gel using a methanol/dichloromethane gradient