Bicarbonate Ion → 4-(4-Iodo-2-methoxyphenyl)-4-methyl-2-oxovaleric acid methyl ester
反応式
[I:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH3:16])([CH3:15])[CH2:9][C:10](=[O:14])[C:11]([OH:13])=[O:12])=[C:4]([O:17][CH3:18])[CH:3]=1.S(Cl)(Cl)=O.[C:23](=O)(O)[O-]>CO>[CH3:23][O:12][C:11](=[O:13])[C:10](=[O:14])[CH2:9][C:8]([C:5]1[CH:6]=[CH:7][C:2]([I:1])=[CH:3][C:4]=1[O:17][CH3:18])([CH3:16])[CH3:15]参加物
実験手順
3 g of 4-(4-iodo-2-methoxyphenyl)-4-methyl-2-oxovaleric acid (WO 98/54159) is added in a solution of 1.3 ml of thionyl chloride in 12 ml of methanol at 0° C. and stirred for 10 hours at room temperature. It is added to saturated bicarbonate solution and extracted with ethyl acetate. The organic phase is washed with bicarbonate solution and brine, dried (Na2SO4) and concentrated by evaporation. 3.2 g of 4-(4-iodo-2-methoxyphenyl)-4-methyl-2-oxovaleric acid methyl ester is obtained as a crude product. This ester is mixed with 4.5 ml of trifluoromethyltrimethylsilane in 70 ml of DMF and 1.63 g of cesium carbonate at 0C and stirred for 10 hours at room temperature. 20 mg of tetrabutylammonium fluoride is added, and it is stirred for another 30 minutes at room temperature. The batch is added to water and extracted with ethyl acetate. The organic phase is washed with water and brine, dried (Na2SO4) and concentrated by-evaporation. After chromatography on silica gel (hexane/ethyl acetate 0->15%), 1.47 g of the title compound is obtained as a yellow oil.
後処理
- extractionextracted with ethyl acetate
- washThe organic phase is washed with bicarbonate solution and brine
- dry with materialdried (Na2SO4)
- concentrationconcentrated by evaporation
出典と根拠
- ORDレコード
- ord-5f12e9f797b04d1a87f87724d23dbd43
- 出典データセット
- uspto-grants-2010_02
- 特許番号
- US07662821B2
反応ノート
読み込み中…