تفاعل #985491

معادلة التفاعل

2,3,4,9-tetrahydro-1H-carbazol-1-one

hydroxylamine hydrochloride

sodium acetate

→

2,3,4,9-tetrahydro-1H-carbazol-1-amine

المذيبات

water

ethanol

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe reaction mixture was heated
2. 2
   درجة الحرارةat reflux for 2 h
3. 3
   درجة الحرارةcooled
4. 4
   تركيزconcentrated
5. 5
   workup.ADDITIONThe residue was diluted with water
6. 6
   استخلاصextracted with ethyl acetate (2×100 mL)
7. 7
   تجفيفThe organic phase was dried over sodium sulfate
8. 8
   ترشيحfiltered
9. 9
   تركيزconcentrated to a brown solid
10. 10
    workup.DISSOLUTIONThe oxime was dissolved in THF (80 mL)
11. 11
    workup.ADDITIONLAH (1.0 M in THF, 24.3 mL) was added dropwise
12. 12
    درجة الحرارةThe reaction was heated
13. 13
    درجة الحرارةat reflux for 7 h
14. 14
    درجة الحرارةcooled in an ice bath
15. 15
    workup.ADDITIONMethanol was added dropwise
16. 16
    أخرىuntil bubbling
17. 17
    workup.ADDITIONThe mixture was diluted with aqueous Na/K tartrate
18. 18
    استخلاصextracted with ethyl acetate (2×100 mL)
19. 19
    تجفيفdried over sodium sulfate
20. 20
    ترشيحfiltered
21. 21
    تركيزconcentrated
22. 22
    أخرىThe crude amine was purified by flash chromatography on silica (2% to 5% methanol/methylene chloride gradient)

الإجراء التجريبي

To a solution of 2,3,4,9-tetrahydro-1H-carbazol-1-one (1.5 g, 8.10 mmol) in ethanol (20 mL) was added a solution of hydroxylamine hydrochloride (1.13 g, 16.2 mmol) in water (10 mL) and a solution of sodium acetate (2.19 g, 26.7 mmol) in water (10 mL). The reaction mixture was heated at reflux for 2 h, cooled and concentrated. The residue was diluted with water and extracted with ethyl acetate (2×100 mL). The organic phase was dried over sodium sulfate, filtered and concentrated to a brown solid. The oxime was dissolved in THF (80 mL) and LAH (1.0 M in THF, 24.3 mL) was added dropwise. The reaction was heated at reflux for 7 h and cooled in an ice bath. Methanol was added dropwise until bubbling ceased. The mixture was diluted with aqueous Na/K tartrate, stirred vigorously for 15 min and extracted with ethyl acetate (2×100 mL). The extracts were combined, dried over sodium sulfate, filtered and concentrated. The crude amine was purified by flash chromatography on silica (2% to 5% methanol/methylene chloride gradient) to provide 2,3,4,9-tetrahydro-1H-carbazol-1-amine as a brown oil. The oil was diluted in diethyl ether and HCl (1.0 M in diethyl ether) was added. The resulting precipitate was collected by filtration to provide 2,3,4,9-tetrahydro-1H-carbazol-1-amine hydrochloride (760 mg, 42%) as a light brown solid. 1H-NMR (CD3OD): δ 7.54 (d, 1H), 7.42 (d, 1H), 7.22 (t, 1H), 7.09 (t, 1H), 4.66 (t, 1H), 2.95-2.73 (m, 2H), 2.39-2.28 (m, 1H), 2.18-2.03 (m, 3H); MS m/z (M+1) 170.

المصدر