تفاعل #162459

معادلة التفاعل

trimethylsilyl cyanide

Acetonitrile

6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridine 4-oxide

Triethylamine

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title compound

المردود 77.1%

6-Bromo-1-methyl-1H-pyrrolo[3,2-b]pyridine-5-carbonitrile

المردود 77.1%

المذيبات

DCM

ظروف التفاعل

المعالجة

1. 1
   workup.DISTILLATIONthe mixture was distilled at 45° C. to a volume of about 110 L (2.5 L/kg)
2. 2
   workup.ADDITIONMore ACN (80 kg) was added
3. 3
   workup.DISTILLATIONthe mixture was again distilled at 45° C. to a volume of about 110 L
4. 4
   درجة الحرارةwhile maintaining the temperature of the mixture below 25° C
5. 5
   درجة الحرارةThe reaction mixture was gradually heated to 70±5° C
6. 6
   أخرىthe starting material was consumed
7. 7
   درجة الحرارةThe reaction mixture was cooled to 10±5° C
8. 8
   workup.ADDITIONA 20% aqueous K2CO3 solution (260 kg) was added
9. 9
   workup.STIRRINGthe mixture was stirred at 10±5° C. for 1 hour
10. 10
    ترشيحThe resulting precipitate was filtered
11. 11
    غسيلThe reactor was rinsed with a 2.3% aqueous K2CO3 solution (133 kg)
12. 12
    غسيلto wash the filter cake, which
13. 13
    workup.WAITwas slurried in water (180 kg) for 30 minutes
14. 14
    ترشيحfiltered
15. 15
    workup.WAITThe filter cake was again slurried in water (180 kg) for 30 minutes
16. 16
    ترشيحfiltered
17. 17
    workup.ADDITIONThe filtered solids were dispersed in a solution of DCM (1166 kg) and THF (156 kg)
18. 18
    workup.STIRRINGThe mixture was stirred for 2 hours at 30±5° C
19. 19
    workup.ADDITIONActivated carbon (7.0 kg, 0.16 kg/kg) was added
20. 20
    workup.STIRRINGthe mixture was stirred at 30±5° C. for 2 hours
21. 21
    ترشيحfiltered through a pad of Celite under pressure
22. 22
    غسيلThe reactor was rinsed with DCM (200 kg)
23. 23
    غسيلto wash the filter cake
24. 24
    workup.DISTILLATIONThe combined filtrate was distilled at 40±5° C. to a volume of about 170 L
25. 25
    workup.ADDITIONNext, n-heptane (120 kg) was added to the mixture, which
26. 26
    تركيزwas concentrated by distillation at 40±5° C. to a volume of about 170 L
27. 27
    workup.ADDITIONMore n-heptane (238 kg) was added to the mixture
28. 28
    درجة الحرارةThe slurry was cooled to 5±5° C.
29. 29
    workup.STIRRINGstirred for 1 hour
30. 30
    ترشيحThe resulting precipitate was filtered under pressure
31. 31
    غسيلthe filter cake was washed with n-heptane (68 kg) from the reactor
32. 32
    غسيلrinse
33. 33
    أخرىThe wet cake was dried under vacuum at 40° C. for 20 hours

الإجراء التجريبي

A solution of 6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridine 4-oxide (42.8 kg, 188 mol) in DCM from the previous step was distilled at 45° C. to a volume of about 85 L. Acetonitrile (100 kg) was added and the mixture was distilled at 45° C. to a volume of about 110 L (2.5 L/kg). More ACN (80 kg) was added and the mixture was again distilled at 45° C. to a volume of about 110 L. Triethylamine (80 kg, 791 mol) was added. The mixture was cooled to 10±5° C. and trimethylsilyl cyanide (81.6 kg, 822 mol) was added over the course of 15 minutes while maintaining the temperature of the mixture below 25° C. The reaction mixture was gradually heated to 70±5° C. After stirring for 10 hours at this temperature, the starting material was consumed. The reaction mixture was cooled to 10±5° C. A 20% aqueous K2CO3 solution (260 kg) was added and the mixture was stirred at 10±5° C. for 1 hour. The resulting precipitate was filtered. The reactor was rinsed with a 2.3% aqueous K2CO3 solution (133 kg). The rinse was used to wash the filter cake, which was slurried in water (180 kg) for 30 minutes and filtered. The filter cake was again slurried in water (180 kg) for 30 minutes and filtered. The filtered solids were dispersed in a solution of DCM (1166 kg) and THF (156 kg). The mixture was stirred for 2 hours at 30±5° C. Activated carbon (7.0 kg, 0.16 kg/kg) was added and the mixture was stirred at 30±5° C. for 2 hours and filtered through a pad of Celite under pressure. The reactor was rinsed with DCM (200 kg) and the rinse was used to wash the filter cake. The combined filtrate was distilled at 40±5° C. to a volume of about 170 L. Next, n-heptane (120 kg) was added to the mixture, which was concentrated by distillation at 40±5° C. to a volume of about 170 L. More n-heptane (238 kg) was added to the mixture. The slurry was cooled to 5±5° C. and stirred for 1 hour. The resulting precipitate was filtered under pressure and the filter cake was washed with n-heptane (68 kg) from the reactor rinse. The wet cake was dried under vacuum at 40° C. for 20 hours to give the title compound as an off-white solid (34.2 kg).

المصدر