反応式
Br[C:2]1[CH:3]=[C:4]([CH3:15])[C:5]2[S:10][CH2:9][CH2:8][C:7]([CH3:12])([CH3:11])[C:6]=2[C:13]=1[CH3:14].C([Li])CCC.CN(C)[CH:23]=[O:24].Cl>C(OCC)C>[CH3:11][C:7]1([CH3:12])[C:6]2[C:13]([CH3:14])=[C:2]([CH:23]=[O:24])[CH:3]=[C:4]([CH3:15])[C:5]=2[S:10][CH2:9][CH2:8]1参加物
実験手順
6-Bromo-3,4-dihydro-4,4,5,8-tetramethyl-2H-1-benzothiopyran (19.8 g, World Patent Application 95/04054) was dissolved in diethyl ether (350 mL) and treated with n-butyllithium (2.5N in hexanes, 42 mL). The mixture was stirred at room temperature for 1 h and then cooled in a dry-ice/acetone bath. Dimethylformamide (16 mL) was added over a period of several minutes and the reaction bath was allowed to warm to -40° C. Hydrochloric acid (1N aqueous, 100 mL) was added and the mixture was allowed to warm to 23° C. The organic phase was separated and washed with saturated aqueous sodium bicarbonate solution (100 mL). The organic phase was dried over magnesium sulfate, filtered, and evaporated under reduced pressure. The residue was subjected to chromatography on silica gel using hexanes/ether (9:1) as eluent to afford the desired compound as a yellow semi-solid (7.7 g). 1H NMR(CDCl3): δ 1.5 (6H), 2.0 (2H), 2.3 (3H), 2.8 (3H), 3.0 (2H), 7.4 (1H), 10.2 (1H).
後処理
- temperaturecooled in a dry-ice/acetone bath
- temperatureto warm to -40° C
- temperatureto warm to 23° C
- customThe organic phase was separated
- washwashed with saturated aqueous sodium bicarbonate solution (100 mL)
- dry with materialThe organic phase was dried over magnesium sulfate
- filtrationfiltered
- customevaporated under reduced pressure
出典と根拠
- ORDレコード
- ord-415b27028875405d86f41fbc30253639
- 出典データセット
- uspto-grants-1998_03
- 特許番号
- US05723411
関連ノート
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