Реакция #4196

Уравнение реакции

4-methyl-N-[2-(6-bromo-1,2,3,4-tetrahydro-1-quinolinyl)phenyl]piperazine-carboxamide

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product

Выход 79.0%

5-Bromo-7-(4-methyl-1-piperazinyl)-2,3-dihydro-1H-quino[1,8-ab][1,5]benzodiazepine

Выход 79.0%

Растворители

phosphorus oxychloride

Условия реакции

Обработка

1. 1
   Температураwas heated
2. 2
   Температураunder reflux under nitrogen for 5 hours
3. 3
   Другоеexcess phosphorous oxychloride was removed at aspirator pressure
4. 4
   Температураwith heating
5. 5
   ТемператураThe residue was chilled in an ice-bath (with exclusion of moisture)
6. 6
   workup.ADDITIONtreated with ice-cold 2N sodium hydroxide solution (250 ml) and dichloromethane (500 ml)
7. 7
   Другоеthe organic phase was separated
8. 8
   Промывкаwashed with 2N sodium hydroxide solution, twice with water
9. 9
   Сушкаdried over anhydrous sodium sulfate
10. 10
    Концентрированиеconcentrated in vacuo

Методика

A stirred mixture of 4-methyl-N-[2-(6-bromo-1,2,3,4-tetrahydro-1-quinolinyl)phenyl]piperazine-carboxamide (14.2 g, 0.0330 mole) in phosphorus oxychloride (250 ml) was heated under reflux under nitrogen for 5 hours. The reaction mixture was cooled to room temperature and excess phosphorous oxychloride was removed at aspirator pressure with heating. The residue was chilled in an ice-bath (with exclusion of moisture), and treated with ice-cold 2N sodium hydroxide solution (250 ml) and dichloromethane (500 ml). The mixture was stirred, the organic phase was separated, washed with 2N sodium hydroxide solution, twice with water, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue was digested in boiling methanol (40 ml) to afford 10.7 g (79%) of product. Recrystallization from ethanol provided the analytical sample, mp 181°-183° C.

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