N-(1-benzoyl-4-piperidinyl)-2-(2-carbamoylethyl)aniline → 1-(1-Benzoyl-piperidin-4-yl)-3,4-dihydro-1H-quinolin-2-one
Reaction equation
[C:1]([N:9]1[CH2:14][CH2:13][CH:12]([NH:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=2[CH2:22][CH2:23][C:24](=[O:26])N)[CH2:11][CH2:10]1)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>Cl>[C:1]([N:9]1[CH2:10][CH2:11][CH:12]([N:15]2[C:16]3[C:17](=[CH:18][CH:19]=[CH:20][CH:21]=3)[CH2:22][CH2:23][C:24]2=[O:26])[CH2:13][CH2:14]1)(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Participants
3
Reactant 1
Product 1
Reagents, catalysts & solvents 1
Procedure
To N-(1-benzoyl-4-piperidinyl)-2-(2-carbamoylethyl)aniline (85 g) prepared in Reference Example 4 is added 5% hydrochloric acid (500 ml) and the mixture is refluxed for 5 hours. After cooling, the reaction mixture is extracted with diethyl ether and the aqueous layer is made alkaline with a 50% aqueous sodium hydroxide solution and extracted with ethyl acetate. The extract is dried over sodium carbonate and concentrated. The concentrate is purified by silica gel column chromatography (eluent; n-hexane/ethyl acetate=1/10-10/1) and recrystallized from ethanol/n-hexane to give 1-(1-benzoyl-4-piperidinyl)-3,4-dihydrocarbostyril (35 g) as white powders, m.p. 108°-111° C.