N-[5-methyl-2-(2,3-dihydro-1H-indol-1-yl)phenyl]-4-methyl-1-piperazinecarboxamide → 6-(4-Methyl-1-piperazinyl)-9-methyl-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepine

HRID 4058Notes

Reaction equation

HRID 4058 reaction equation
[CH3:1][C:2]1[CH:3]=[CH:4][C:5]([N:18]2[C:26]3[C:21](=[CH:22][CH:23]=[CH:24][CH:25]=3)[CH2:20][CH2:19]2)=[C:6]([NH:8][C:9]([N:11]2[CH2:16][CH2:15][N:14]([CH3:17])[CH2:13][CH2:12]2)=O)[CH:7]=1>P(Cl)(Cl)(Cl)=O>[CH3:1][C:2]1[CH:3]=[CH:4][C:5]2[N:18]3[CH2:19][CH2:20][C:21]4[C:26]3=[C:25]([CH:24]=[CH:23][CH:22]=4)[C:9]([N:11]3[CH2:16][CH2:15][N:14]([CH3:17])[CH2:13][CH2:12]3)=[N:8][C:6]=2[CH:7]=1

Participants

3

Reactant 1

HCID 13823356N-[5-methyl-2-(2,3-dihydro-1H-indol-1-yl)phenyl]-4-methyl-1-piperazinecarboxamide

Product 1

HCID 138232916-(4-Methyl-1-piperazinyl)-9-methyl-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]benzodiazepineYield 41%

Reagents, catalysts & solvents 1

HCID 24813Phosphorus oxychlorideSolvent

Procedure

A stirred mixture of 35.1 (0.10 mole) of N-[5-methyl-2-(2,3-dihydro-1H-indol-1-yl)phenyl]-4-methyl-1-piperazinecarboxamide of Example 5c in 500 ml of phosphorus oxychloride was refluxed for 6 hours under nitrogen, then cooled to room temperature. The excess phosphorus oxychloride was removed at aspirator pressure with gentle warming. The residue was chilled in an ice-bath (with exclusion of moisture), and then treated first with 250 ml of ice-cold 2N-NaOH, then with 500 ml of chloroform. The mixture was stirred vigorously until all the material passed into solution. The organic phase was separated, washed thrice with water, and concentrated in vacuo to an oil. This was dissolved in 100 ml of boiling acetone, then allowed to crystallize at room temperature to afford 13.5 g (41% overall yield) of 9-methyl-6-(4-methyl-1-piperazinyl)-1,2-dihydrobenzo[b]pyrrolo[3,2,1-jk][1,4]-benzodiazepine, m.p. 160°-162° C.

Workup

  1. temperaturewas refluxed for 6 hours under nitrogen
  2. customThe excess phosphorus oxychloride was removed at aspirator pressure with gentle warming
  3. temperatureThe residue was chilled in an ice-bath (with exclusion of moisture)
  4. additiontreated first with 250 ml of ice-cold 2N-NaOH
  5. customThe organic phase was separated
  6. washwashed thrice with water
  7. concentrationconcentrated in vacuo to an oil
  8. dissolutionThis was dissolved in 100 ml of boiling acetone
  9. customto crystallize at room temperature

Sources & evidence

ORD record
ord-a5ce352d39dd40c585d35d1aac501dc7
Source dataset
uspto-grants-1988_02
Patent number
US04723003

Reaction notes

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