反应详情

In a mixture of 70 ml of acetone and 7 ml of water were suspended 1.9 g of 2-mercapto-3-methylquinoxaline and 1.95 g of 2-picolyl chloride hydrochloride. To the suspension was added 4.0 g of potassium carbonate. The resulting mixture was stirred at room temperature for 1 hr., and the solvent was removed under reduced pressure. The residue was extracted with chloroform after addition of chloroform and water. The organic layer was separated and dried over sodium sulfate. The sodium sulfate was removed by filtration, and the filtrate was placed under reduced pressure to remove the solvent. The residue was dissolved in 20 ml of ethanol. To the solution under chilling with ice were successively added 3.2 ml of 5.2N ethanolic hydrochloric acid and ether to precipitate crystals. The crystals were collected by filtration to give 2.25 g of 3-methyl-2-(2-pyridylmethylthio)quinoxaline hydrochloride as a violet crystalline powder.

1. custom, and the solvent was removed under reduced pressure
2. extractionThe residue was extracted with chloroform
3. additionafter addition of chloroform and water
4. customThe organic layer was separated
5. dry with materialdried over sodium sulfate
6. customThe sodium sulfate was removed by filtration
7. customto remove the solvent
8. dissolutionThe residue was dissolved in 20 ml of ethanol
9. temperatureTo the solution under chilling with ice
10. customto precipitate crystals
11. filtrationThe crystals were collected by filtration