反应详情

温度

40 °C

In this reference example, 16.0 g of 1-benzyl-4-[3,5-dihydro-2(1H)-quinazolinon-1-yl]-piperidine, 4.0 g of 10% Pd-C, 50 ml of 1 N hydrochloric acid, 150 ml of water and 300 ml of methanol are mixed and stirred at 40° C. Hydrogen gas is introduced to the mixture for 5 hours with stirring. Then, the Pd-C is removed by filtration and the filtrate is concentrated. The white crystalline residue is dissolved in 50 ml of water. The solution is adjusted to pH 10 with aqueous 5 N sodium hydroxide and extracted with chloroform. The extract is washed with water, dried and thereafter concentrated. Then, 50 ml of a mixture of ethyl acetate and n-hexane (1:1 by volume) is added to the residue. After trituration, the solid is separated by filtration, washed with the same mixed solvent to obtain 9.9 g of a crude product. The crude product is recrystallized from water-ethanol to obtain 5.1 g of the desired product.

1. stirringwith stirring
2. customThen, the Pd-C is removed by filtration
3. concentrationthe filtrate is concentrated
4. dissolutionThe white crystalline residue is dissolved in 50 ml of water
5. extractionextracted with chloroform
6. washThe extract is washed with water
7. customdried
8. concentrationconcentrated
9. additionThen, 50 ml of a mixture of ethyl acetate and n-hexane (1:1 by volume) is added to the residue
10. customAfter trituration, the solid is separated by filtration
11. washwashed with the same mixed solvent
12. customto obtain 9.9 g of a crude product
13. customThe crude product is recrystallized from water-ethanol