2-Bromo-2'-nitroacetophenone → 4-[4-(2-Nitro-phenyl)-oxazol-2-yl]-butyric acid methyl ester
反応式
Br[CH2:2][C:3]([C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[N+:11]([O-:13])=[O:12])=O.[CH3:14][O:15][C:16](=[O:23])[CH2:17][CH2:18][CH2:19][C:20](=[O:22])[NH2:21]>CO>[CH3:14][O:15][C:16](=[O:23])[CH2:17][CH2:18][CH2:19][C:20]1[O:22][CH:2]=[C:3]([C:5]2[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=2[N+:11]([O-:13])=[O:12])[N:21]=1参加物
4
実験手順
Combine 2-bromo-2′-nitroacetophenone (10.4 g, 42.6 mmol) with 4-carbamoyl-butyric acid methyl ester (12.2 g, 84.1 mmol) and heat the neat mixture in a sealed vessel at 120-150° C. for about 4-6 h. Cool the mixture, transfer to a round bottom flask with methanol and concentrate. Partition the residue between water and EtOAc. Dry the combined EtOAc extracts over Na2SO4 and concentrate. Initial chromatography over silica gel (EtOAc/CH2Cl2) followed by a second chromatography over silica gel (Hex/EtOAc) allowed for recovery of 4-[4-(2-nitro-phenyl)-oxazol-2-yl]-butyric acid methyl ester (3.05 g, 25%). MS (ES): (M+1)+ 291.1, 292.2 m/z.