Reaction #4111

Reaction equation

9-methyl-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepin-6-one

4-methylpiperidine

→

9-Methyl-6-(4-methyl-1-piperidinyl)-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepine

Solvents

toluene

Conditions

Workup

1. 1
   Temperaturewas heated under nitrogen until a solution
2. 2
   Otherresulted
3. 3
   TemperatureThe mixture was heated
4. 4
   Temperatureunder reflux for three hours
5. 5
   Filtrationfiltered
6. 6
   Otherthe layers were separated
7. 7
   ExtractionThe aqueous phase was extracted with 250 ml of toluene
8. 8
   Washwashed once with 2N sodium hydroxide solution, twice with water
9. 9
   Dryingdried over anhydrous sodium sulfate
10. 10
    Filtrationfiltered
11. 11
    Concentrationconcentrated in vacuo to 8.1 g (98%) of product
12. 12
    OtherRecrystallization from ethyl acetate
13. 13
    Otherprovided the analytical sample, mp 194°-196° C.

Procedure

A stirred mixture of 6.26 g (0.0250 mole) of 9-methyl-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepin-6-one and 1000 ml of toluene was heated under nitrogen until a solution resulted. Then there was added 24.8 g (0.250 mole) of 4-methylpiperidine, followed by 14.2 g (0.075 mole) of titanium tetrachloride. The mixture was heated under reflux for three hours, cooled to room temperature and filtered. The filtrate was stirred with 500 ml of 2N sodium hydroxide solution for 15 minutes and the layers were separated. The aqueous phase was extracted with 250 ml of toluene. The toluene layers were combined, washed once with 2N sodium hydroxide solution, twice with water, dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo to 8.1 g (98%) of product. Recrystallization from ethyl acetate provided the analytical sample, mp 194°-196° C.

Source