反応式
[H-].[Na+].[CH2:3](P(=O)(OCC)OCC)[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[CH3:18][O:19][C:20](=[O:31])[C:21]1[CH2:22][C:23]([O:29][CH3:30])([CH:26]=[CH:27][CH:28]=1)C=O.[CH3:32]N(C)C=O>>[CH3:18][O:19][C:20]([C:21]1[CH:28]=[C:27]([CH:32]=[CH:3][C:4]2[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:26]=[C:23]([O:29][CH3:30])[CH:22]=1)=[O:31]参加物
実験手順
To a slurry of 1.0 mole of sodium hydride in one liter of N,N-dimethylformamide is added 1.0 mole of diethyl benzylphosphonate. The reaction mixture is stirred for one hour and then a solution of 1.0 mole of 3-methoxyisophthalaldehydic acid methyl ester in a minimal amount of dimethylformamide is added. The reaction mixture is stirred for several hours and is then added to ether-water. The ether extract is washed several times with water, dried over magnesium sulfate and evaporated to a residue. The residue is purified via crystallization from hexane to yield 5-methoxy-3-stilbene carboxylic acid methyl ester. The free acid is obtained by refluxing a solution of 1.0 mole of the methyl ester in one liter in 1 N methanolic sodium hydroxide for 4-5 hours. The reaction mixture is evaporated to a residue which is added to ethyl acetate. The ethyl acetate solution is extracted with several portions of water. The combined aqueous extract is neutralized with 1 N hydrochloric acid and extracted with several portions of ethyl acetate. This organic extract is dried over magnesium sulfate and evaporated to a residue. The residue is purified by crystallization from hexane to yield 5-methoxy-3-stilbene carboxylic acid.
後処理
- stirringThe reaction mixture is stirred for several hours
- extractionThe ether extract
- washis washed several times with water
- dry with materialdried over magnesium sulfate
- customevaporated to a residue
- customThe residue is purified via crystallization from hexane
出典と根拠
- ORDレコード
- ord-4fc320218f8640cba7b1a1fe4fed7207
- 出典データセット
- uspto-grants-1979_08
- 特許番号
- US04165323
関連ノート
読み込み中…