Diketene → HCID 178441547, compound
Reaction equation
[CH2:1]([C:5]1[N:17]([CH2:18][C:19]2[CH:24]=[CH:23][C:22]([C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:31]3[NH:35][N:34]=[N:33][N:32]=3)=[CH:21][CH:20]=2)[C:8]2[CH:9]([C:13]([O:15][CH3:16])=[O:14])[NH:10][CH2:11][CH2:12][C:7]=2[N:6]=1)[CH2:2][CH2:3][CH3:4].[CH2:36]=[C:37]1[O:41][C:39](=[O:40])[CH2:38]1>CO>[CH2:1]([C:5]1[N:17]([CH2:18][C:19]2[CH:24]=[CH:23][C:22]([C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:31]3[NH:35][N:34]=[N:33][N:32]=3)=[CH:21][CH:20]=2)[C:8]2[CH:9]([C:13]([O:15][CH3:16])=[O:14])[N:10]([C:39](=[O:40])[CH2:38][C:37]([CH3:36])=[O:41])[CH2:11][CH2:12][C:7]=2[N:6]=1)[CH2:2][CH2:3][CH3:4]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a mixture of the compound obtained in Example 3 (0.50 g) and methanol (10 ml) is added diketene (0.20 g), and the mixture is stirred at room temperature for two hours. The mixture is evaporated under reduced pressure to remove the solvent, and to the residue is added chloroform. The mixture is washed, dried and evaporated under reduced pressure. The resulting residue is purified by silica gel column chromatography (solvent; chloroform/ethyl acetate/methanol=10:10:1) to give methyl 2-n-butyl-5-acetoacetyl-3-[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl-4,5,6,7-tetrahydroimidazo[4,5-c]pyridine-4-carboxylate (0.29 g) as a foam.