反应详情

45 g of 5-amino-3,4-dihydrocarbostyril was suspended in 250 ml of a 15% hydrochloric acid and 250 ml of water having dissolved therein 20 g of sodium nitrite was added dropwise to the mixture followed by stirring at room temperature for 1 hour. The resulting solution was added dropwise to a solution prepared by dissolving 41.2 g of cuprous chloride in 120 ml of concentrated hydrochloric acid at room temperature while stirring. After completion of the addition, the mixture was heated on a water bath at 50° to 60° C. for 1 hour while stirring. After allowing the mixture to cool to precipitate crystals, they were collected by filtration and washed with water. The wet crystals were dissolved in chloroform and insoluble materials were removed by filtration. The residue was dried over anhydrous sodium sulfate. After removal of the solvent the residue was dissolved with heating and the solution was treated with activated carbon while hot. The ethanolic solution thus-treated was concentrated under reduced pressure. Recrystallization of the concentrate from ethanol gave 31.5 g of 5-chloro-3,4-dihydrocarbostyril having a melting point of 193° to 194° C.

1. dissolutiondissolved
2. additionThe resulting solution was added dropwise to a solution
3. customprepared
4. stirringwhile stirring
5. additionAfter completion of the addition
6. temperaturethe mixture was heated on a water bath at 50° to 60° C. for 1 hour
7. stirringwhile stirring
8. temperatureto cool
9. customto precipitate crystals, they
10. filtrationwere collected by filtration
11. washwashed with water
12. dissolutionThe wet crystals were dissolved in chloroform
13. custominsoluble materials were removed by filtration
14. dry with materialThe residue was dried over anhydrous sodium sulfate
15. customAfter removal of the solvent the residue
16. dissolutionwas dissolved
17. temperaturewith heating
18. additionthe solution was treated with activated carbon while hot
19. additionThe ethanolic solution thus-treated
20. concentrationwas concentrated under reduced pressure
21. customRecrystallization of the
22. concentrationconcentrate from ethanol