[NH:1]1[CH2:6][CH2:5][CH:4]([N:7]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[CH2:11][CH2:10][C:8]2=[O:9])[CH2:3][CH2:2]1.C(N(CC)CC)C.[NH:25]1[CH:29]=[CH:28][CH:27]=[C:26]1[C:30](O)=[O:31].P(C#N)(OCC)(OCC)=O>ClCCl.O>[NH:25]1[CH:29]=[CH:28][CH:27]=[C:26]1[C:30]([N:1]1[CH2:6][CH2:5][CH:4]([N:7]2[C:17]3[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=3)[CH2:11][CH2:10][C:8]2=[O:9])[CH2:3][CH2:2]1)=[O:31]1-(4-Piperidinyl)-3,4-dihydrocarbostyril (500 mg), triethylamine (1.2 ml) and pyrrole-2-carboxylic acid (314 mg) are dissolved in dichloromethane (10 ml) and thereto is added dropwise diethyl cyanophosphate (0.82 ml) under ice cooling. The mixture is stirred with ice cooling for 1 hour and then stirred at room temperature for 2 hours. The mixture is poured into water, extracted with chloroform, dried with sodium carbonate and purified by silica gel column chromatography (solvent; dichloromethane:methanol=20:1). The resultant is recrystallized from n-hexane/diethyl ether to give 1-[1-(2-pyrrolylcarbonyl)-4-piperidinyl]-3,4-dihydrocarbostyril (0.2 g), as white powder, m.p. 161°-162° C. (decomposed).
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