Hydrochloric Acid → Diethyl 2,6-bis(trifluoromethyl)-4-methoxy-3,5-pyridinedicarboxylate
反応式
[Li+].CC([N-]C(C)C)C.C(NC(C)C)(C)C.[Li]CCCC.[F:21][C:22]([F:41])([F:40])[C:23]1[C:28]([C:29]([O:31][CH2:32][CH3:33])=[O:30])=[C:27]([O:34][CH3:35])[CH:26]=[C:25]([C:36]([F:39])([F:38])[F:37])[N:24]=1.Cl[C:43]([O:45][CH2:46][CH3:47])=[O:44].Cl>COCCOC.O>[F:41][C:22]([F:40])([F:21])[C:23]1[C:28]([C:29]([O:31][CH2:32][CH3:33])=[O:30])=[C:27]([O:34][CH3:35])[C:26]([C:43]([O:45][CH2:46][CH3:47])=[O:44])=[C:25]([C:36]([F:39])([F:38])[F:37])[N:24]=1参加物
反応物 6
生成物 1
試薬・触媒・溶媒 2
反応条件
- 温度
- -78 °C
実験手順
To a cold (-78° C.) solution of LDA, from 0.02 mol (2.8 ml) of diisopropylamine, 0.0208 mol of n-BuLi, and 30 ml of DME was added a solution of 4.65 g (0.015 mol) of product of Example 4 in 20 ml of DME. The resulting greenish solution was stirred at -78° C. for 10 minutes and treated with 2.7 ml (0.035 mol) of ethyl chloroformate. The reaction mixture was warmed to room temperature in 40 minutes, then poured into a mixture of 20 ml of concentrated HCl and 50 ml of water. The mixture was extracted with ether (200 ml). The ether extract was dried and concentrated. The residue was kugelrohr distilled at 13 Pa. The earlier fraction (pot temperature 50°-65° C.) was discarded. The later fraction (pot temperature 90° C.) was an oil (5.47 g) which was crystallized from hexane at low temperature to give 4.4 g (75%) of product; mp 46.5°-47.5° C.
後処理
- temperatureThe reaction mixture was warmed to room temperature in 40 minutes
- extractionThe mixture was extracted with ether (200 ml)
- extractionThe ether extract
- customwas dried
- concentrationconcentrated
- distillationThe residue was kugelrohr distilled at 13 Pa
- customThe earlier fraction (pot temperature 50°-65° C.)
- customThe later fraction (pot temperature 90° C.)
- customwas crystallized from hexane at low temperature
出典と根拠
- ORDレコード
- ord-951e4010df13437c9835041e3e7662b9
- 出典データセット
- uspto-grants-1990_05
- 特許番号
- US04921530
反応ノート
読み込み中…