反应详情

A solution of sodium nitrite (0.3 g) in water (3 ml) was added, over 15 min. to a stirred suspension of N-[(4-aminophenyl)methyl]methanesulphonamide (0.7 g ) in concentrated hydrochloric acid (3 ml) and water (4 ml) keeping the temperature below 0°. After 1 h, the resulting suspension was added, over 1 min. to a stirred, ice-cooled solution of sodium acetate (3.2 g) and sodium sulphite (1.8 g) in water (20 ml) containing ice (5 g). The orange mixture was stirred for a further 30 min. then at room temperature for 1.5 h, and then warmed on the steam bath for 20 min. The mixture was cooled, concentrated hydrochloric acid (15 ml) added and the mixture warmed on the steam bath for 0.5 h. The solvent was evaporated in vacuo and the residue re-evaporated with absolute ethanol (2×50 ml). The residue was extracted with absolute ethanol (50 ml). The extract was evaporated in vacuo and the residue re-evaporated with ethanol (20 ml) to leave a brown oil, which partially crystallised after standing overnight. Ethanol (1 ml) was added and the title compound filtered off as light tan crystals (0.1 g) m.p. 165°-70° (dec.)

1. customthe temperature below 0°
2. additionthe resulting suspension was added, over 1 min. to a stirred, ice-
3. waitat room temperature for 1.5 h
4. temperaturewarmed on the steam bath for 20 min
5. temperatureThe mixture was cooled
6. temperaturethe mixture warmed on the steam bath for 0.5 h
7. customThe solvent was evaporated in vacuo
8. customthe residue re-evaporated with absolute ethanol (2×50 ml)
9. extractionThe residue was extracted with absolute ethanol (50 ml)
10. customThe extract was evaporated in vacuo
11. customthe residue re-evaporated with ethanol (20 ml)
12. customto leave a brown oil, which
13. custompartially crystallised
14. waitafter standing overnight
15. additionEthanol (1 ml) was added
16. filtrationthe title compound filtered off as light tan crystals (0.1 g) m.p. 165°-70° (dec.)