反应详情

1-(4-Piperidinyl)-3,4-dihydrocarbostyril (500 mg) and triethylamine (0.6 ml) are dissolved in dichloromethane (10 ml) and thereto is added dropwise ethyl chlorocarbonate (0.31 ml) gradually. The mixture is stirred at room temperature for 2 hours and poured into water. The mixture is extracted with chloroform, dried with sodium carbonate and purified by silica gel column chromatography (solvent; n-hexane:ethyl acetate=3:1). The resultant is recrystallized from ethanol/n-hexane to give 1-(1-ethoxycarbonyl-4-piperidinyl)-3,4-dihydrocarbostyril (0.1 g) as white powder, m.p. 82°-83° C.

1. extractionThe mixture is extracted with chloroform
2. dry with materialdried with sodium carbonate
3. custompurified by silica gel column chromatography (solvent; n-hexane:ethyl acetate=3:1)
4. customThe resultant is recrystallized from ethanol/n-hexane