Thiourea → 6-Methyl-4,5,6,7-tetrahydro-1,3-benzothiazol-2-amine
反応式
[NH2:1][C:2]([NH2:4])=[S:3].Br[CH:6]1[CH2:11][CH:10]([CH3:12])[CH2:9][CH2:8][C:7]1=O>C(O)C>[NH2:1][C:2]1[S:3][C:6]2[CH2:11][CH:10]([CH3:12])[CH2:9][CH2:8][C:7]=2[N:4]=1参加物
4
実験手順
Thiourea (22.3 g., 0.29 mole) was slurried in 275 ml. of ethanol. 2-Bromo-4-methylcyclohexanone was added and the mixture heated to reflux for 75 minutes. The reaction mixture was cooled to room temperature and the crude product recovered as the hydrobromide salt by filtration. The crude salt was dissolved in warm water, filtered and made basic with ammonium hydroxide to precipitate the free base as an oil, which crystallized on cooling. Purified 2-amino-4,5,6,7-tetrahydro-6-methylbenzthiazole (25.2 g., m.p. 98°-100° C.) was obtained by recrystallization from cyclohexane.
後処理
- temperaturethe mixture heated
- temperatureto reflux for 75 minutes
- filtrationthe crude product recovered as the hydrobromide salt by filtration
- dissolutionThe crude salt was dissolved in warm water
- filtrationfiltered
- customto precipitate the free base as an oil, which
- customcrystallized
- temperatureon cooling
出典と根拠
- ORDレコード
- ord-6c21d931920e406a87f2ad2e4e7c0c6d
- 出典データセット
- uspto-grants-1982_03
- 特許番号
- US04321372
反応ノート
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