Carbon Dioxide → 1,3-Benzoxazole-2-carboxylic acid
反応式
[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[N:9][C:4]=2[CH:3]=[CH:2]1.C([Li])CCC.[C:15](=[O:17])=[O:16]>C1COCC1>[O:1]1[C:5]2[CH:6]=[CH:7][CH:2]=[CH:3][C:4]=2[N:9]=[C:8]1[C:15]([OH:17])=[O:16]参加物
5
実験手順
Furopyridine (8, 0.71 g, 5.96 mmol) is treated with n-butyl lithium (2.5M in hexane, 2.86 ml, 7.15 mmol) in anhydrous THF (30 ml) at −78° C. After 30 minutes, dry carbon dioxide is passed through the reaction mixture and the temperature is allowed to rise gradually to room temperature in 3 hours. The mixture is concentrated to dryness. The residue is dissolved in water (˜10 ml) and extracted with ethyl acetate. The aqueous layer is acidified to pH˜3 with 1N HCl and kept in the refrigerator over night. The resulting precipitates are filtered and dried to give azabenzofuran carboxylic acid as a white powder (9)
後処理
- waitto rise gradually to room temperature in 3 hours
- concentrationThe mixture is concentrated to dryness
- dissolutionThe residue is dissolved in water (˜10 ml)
- extractionextracted with ethyl acetate
- waitkept in the refrigerator over night
- customThe resulting precipitates
- filtrationare filtered
- customdried
出典と根拠
- ORDレコード
- ord-3a71fdaae11c4557a7993c6121b3533d
- 出典データセット
- uspto-grants-2008_10
- 特許番号
- US07439374B2
反応ノート
読み込み中…