Ammonium Hydroxide → 1-ethyl-4-chloro-7-nitro-1H-pyrazolo[3,4-b]quinoline

HRID 375866Notes

Reaction equation

HRID 375866 reaction equation
[CH2:1]([N:3]1[C:7]([NH:8][C:9]2[C:10](=[CH:14][CH:15]=[C:16]([N+:18]([O-:20])=[O:19])[CH:17]=2)[C:11](O)=O)=[CH:6][CH:5]=[N:4]1)[CH3:2].[NH4+].[OH-].O=P(Cl)(Cl)[Cl:25]>>[CH2:1]([N:3]1[C:7]2=[N:8][C:9]3[C:10]([C:11]([Cl:25])=[C:6]2[CH:5]=[N:4]1)=[CH:14][CH:15]=[C:16]([N+:18]([O-:20])=[O:19])[CH:17]=3)[CH3:2]

Participants

4

Reactant 3

HCID 14923Ammonium HydroxideHCID 24813Phosphorus oxychlorideHCID 21217705N-(1-ethylpyrazol-5-yl)-4-nitroanthranilic acid

Product 1

HCID 543387961-ethyl-4-chloro-7-nitro-1H-pyrazolo[3,4-b]quinolineYield 82%

Procedure

A mixture of N-(1-ethylpyrazol-5-yl) -4-nitroanthranilic acid (3.4 g, 12.32 mmol) and POCl3 (20 ml) was refluxed for 8 hours. The reaction mixture was poured into ice-water, neutralized with concentrated NH4OH and the resulting solid was collected by filtration, washed with water and dried to afford 2.8 g (82%) of 1-ethyl-4-chloro-7-nitro-1H-pyrazolo[3,4-b]quinoline.

Workup

  1. temperaturewas refluxed for 8 hours
  2. filtrationthe resulting solid was collected by filtration
  3. washwashed with water
  4. customdried

Sources & evidence

ORD record
ord-b689536af61c490a93b79dd0654801fb
Source dataset
uspto-grants-1996_01
Patent number
US05488055

Reaction notes

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