反応 #4108

反応方程式

ethyl N-piperazinocarboxylate

9-bromo-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepine-6-one

sodium hydroxide

→

9-Bromo-6-(4-ethoxycarbonyl-1-piperazinyl)-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepine

溶媒

toluene

反応条件

後処理

1. 1
   温度was heated under nitrogen until a solution
2. 2
   その他resulted
3. 3
   温度The mixture was heated
4. 4
   温度under reflux for three hours
5. 5
   その他the layers were separated
6. 6
   抽出The aqueous phase was extracted with 300 ml of toluene
7. 7
   洗浄washed once with 2N sodium hydroxide solution, twice with water
8. 8
   乾燥dried over anhydrous sodium sulfate
9. 9
   濃縮concentrated in vacuo
10. 10
    その他crystallized
11. 11
    その他Recrystallization from ethyl acetate
12. 12
    その他gave the analytical sample, mp 128°-131° C.

実験手順

A stirred mixture of 7.88 g (0.025 mole) of 9-bromo-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepine-6-one and 1200 ml toluene was heated under nitrogen until a solution resulted. Then there was added 39.6 g (0.250 mole) of ethyl N-piperazinocarboxylate 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 treated with 500 ml of 2N sodium hydroxide solution. After stirring vigorously for 15 minutes, the layers were separated. The aqueous phase was extracted with 300 ml of toluene. The toluene layers were combined, washed once with 2N sodium hydroxide solution, twice with water, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue was taken up in 25 ml of hot methanol from which 8.5 g (75%) of product crystallized. Recrystallization from ethyl acetate gave the analytical sample, mp 128°-131° C.

出典