反応式
[CH3:1][O:2][C:3]1[CH:14]=[CH:13][C:6]2[CH:7]=[C:8]([C:10](O)=[O:11])[O:9][C:5]=2[CH:4]=1.C(Cl)(=O)C([Cl:18])=O>O1CCCC1.CN(C)C=O>[CH3:1][O:2][C:3]1[CH:14]=[CH:13][C:6]2[CH:7]=[C:8]([C:10]([Cl:18])=[O:11])[O:9][C:5]=2[CH:4]=1参加物
実験手順
To a stirred solution of 6.0 g (0,031 mole) of 6-methoxy-2-benzofurancarboxylic acid (A. McGookin, A. Robertson, and W. B. Whalley, J. Chem. Soc. 787 (1940)) in 100 ml of tetrahydrofuran (under a nitrogen atmosphere) was added in one portion, 3.3 ml (4.8 g; 0,038 mole) of oxalyl chloride. The mixture was stirred for 5 minutes, then treated with 3 drops of N,N-dimethylformamide. After stirring at room temperature for 2 hours, the solvent was evaporated to leave a residue of crude 6-methoxy-2-benzofurancarbonyl chloride, mp 96°-99° (amp of 101° is given by A. McGookin, etc., cited above). The residue was re-dissolved in 100 ml of dichloromethane, and the solution was filtered. The filtrate was added dropwise over 20 minutes to an ice-cooled solution of 3.6 g (0,037 mole) of N,)-dimethylhydroxylamine hydrochloride and 9.4 ml (7.7 g; 0,077 mole) of 1-methylpiperidine in 100 ml of dichloromethane. After stirring for 2 hours, the mixture was added to 400 ml of ice-cold 5% aqueous hydrochloric acid. The layers were separated, and the aqueous layer was extracted with fresh dichloromethane (3X 100 ml). The combined organic layers were washed with water (1X 200 ml), 3% aqueous sodium bicarbonate (2X 200 ml), and water again. The extracts were dried (anhydrous magnesium sulfate) and evaporated. Trituration of the residue with ether yielded 5.4 g (74% yield) of the analytically pure amide product, mp 73°-77°.
後処理
- stirringAfter stirring at room temperature for 2 hours
- customthe solvent was evaporated
出典と根拠
- ORDレコード
- ord-9c65a32be28d40a09cf331050e6c83c2
- 出典データセット
- uspto-grants-1995_11
- 特許番号
- US05464856
関連ノート
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