反応式
[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][C:6]([C:7](O)=[O:8])=[C:5]([N+:14]([O-:16])=[O:15])[CH:4]=1.S(Cl)(Cl)=O.[NH3:21]>>[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][C:6]([C:7]([NH2:21])=[O:8])=[C:5]([N+:14]([O-:16])=[O:15])[CH:4]=1参加物
4
実験手順
4,5-Dimethoxy-2-nitrobenzoic acid (3) was treated with thionyl chloride and then reacted with ammonia to give 4,5-dimethoxy-2-nitrobenzamide (4) as described by F. Nomoto et al. Chem. Pharm. Bull., 1990, 38, 1591-1595. The nitro group in compound (4) was reduced with sodium borohydride in the presence of copper sulfate (see C.L. Thomas, Catalytic Processes and Proven Catalysts, Academic Press, New York (1970)) to give 4,5-dimethoxy-2-aminobenzamide (5) which was cyclized by refluxing with formic acid to give 6,7-dimethoxyquinazoline-4(3H)-one (6). Compound (6) was refluxed with phosphorus oxytrichloride to provide the common synthetic precursor (7).
出典と根拠
- ORDレコード
- ord-8be6a258a91d45d784672c58bba29202
- 出典データセット
- uspto-grants-2001_11
- 特許番号
- US06313130B1
関連ノート
読み込み中…