Ethyl orthoformate → Ethyl 2,3-dimethoxy-6-nitrobenzoate
反応式
[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][CH:9]=[C:8]([N+:14]([O-:16])=[O:15])[C:4]=1[C:5]([OH:7])=[O:6].C(OCC)(OCC)O[CH2:19][CH3:20]>CN(C)C=O>[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][CH:9]=[C:8]([N+:14]([O-:16])=[O:15])[C:4]=1[C:5]([O:7][CH2:19][CH3:20])=[O:6]参加物
4
実験手順
2,3-Dimethoxy-6-nitrobenzoic acid (l, 180.0 g, 0.792 mole) was dissolved in triethyl orthoformate (466.2 g, 3.14 mole) optionally containing dimethylformamide (4 mL) and the mixture was heated to reflux for one hour. The solvent was removed in vacuo, the residue was extracted with chloroform (2 L) and the organic layer was dried over magnesium sulfate. Removal of the solvent in vacuo gave the product as a pale brown oil which crystallized upon standing at room temperature, 202 g (100%, m.p. 70°-72° C.). This material could be recrystallized from isopropanol but was generally reacted in the next step without additional purification.