1,8-Diazabicyclo(5.4.0)undec-7-ene → methyl (E) 3-[2-n-butyl-1-[(2-chlorophenyl)methyl]-1H-imidazol-5-yl]-(2-thienyl)methyl-2-propenoate
反応式
C(O[CH:5]([C:17]1[N:21]([CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=2[Cl:29])[C:20]([CH2:30][CH2:31][CH2:32][CH3:33])=[N:19][CH:18]=1)[CH:6]([CH2:11][C:12]1[S:13][CH:14]=[CH:15][CH:16]=1)[C:7]([O:9][CH3:10])=[O:8])(=O)C.N12CCCN=C1CCCCC2>C1(C)C=CC=CC=1>[CH2:30]([C:20]1[N:21]([CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=2[Cl:29])[C:17](/[CH:5]=[C:6](\[CH2:11][C:12]2[S:13][CH:14]=[CH:15][CH:16]=2)/[C:7]([O:9][CH3:10])=[O:8])=[CH:18][N:19]=1)[CH2:31][CH2:32][CH3:33]参加物
4
反応条件
- 温度
- 80 °C
実験手順
A mixture of methyl 3-acetoxy-3-[2-n-butyl-1-(2-chlorophenyl)methyl-1H-imidazol-5-yl]-2-[(2-thienyl)methyl]propanoate (4.36 g, 8.92 mmol) in dry toluene (80 mL) was treated with 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU) (3.2 mL, 21.4 mmol), and the resulting solution was heated at 80° C. under argon for 3 hours. The solvent was evaporated, the residue triturated with ether and activated charcoal was added. After filtration, the filtrate was concentrated to 6.29 g of an oil that was chromatographed over silica gel with 65:35 hexane/ethyl acetate to give 2.89 g (76%) of methyl (E)-3-[2-n-butyl-1-[(2-chlorophenyl)methyl]-1H-imidazol-5-yl]-2-(2-thienyl)methyl-2-propenoate whose NMR and TLC (50% ethyl acetate in hexane on silica gel) were identical to the product prepared by Method A.