HCID 178481981, compound → HCID 178481980, compound

HRID 1461300Notes

Reaction equation

HRID 1461300 reaction equation
[OH:1][C:2]1[C:11]([OH:12])=[N:10][C:9]2[C:4](=[CH:5][C:6]([N+:17]([O-])=O)=[C:7]3[N:15]=[N:14][N:13]([CH3:16])[C:8]3=2)[N:3]=1>Cl>[NH2:17][C:6]1[CH:5]=[C:4]2[C:9]([N:10]=[C:11]([OH:12])[C:2]([OH:1])=[N:3]2)=[C:8]2[N:13]([CH3:16])[N:14]=[N:15][C:7]=12

Participants

3

Reactant 1

HCID 178481981HCID 178481981, compound

Product 1

HCID 178481980HCID 178481980, compound

Reagents, catalysts & solvents 1

HCID 313Hydrochloric AcidSolvent2×

Procedure

A solution of stannous chloride dihydrate (2.26 g, 10 mmol) in 10 ml of conc. hydrochloric acid was added dropwise to a suspension of 7,8-dihydroxy-1-methyl-4-nitro-1H-1,2,3-triazolo[4,5-f]quinoxaline (0.79 g, 3 mmol) in 5 ml of conc. hydrochloric acid with stirring on an oil bath at 60°-70° C. Stirring was continued at this temperature for 90 min. Then the mixture was cooled on an ice bath, and filtered. The precipitate was washed with 1 ml of conc. hydrochloric acid, suspended in 150 ml of hot water, and adjusted to pH 6-7 with solid sodium hydrogen carbonate. After reflux for 1 h the mixture was cooled on ice and the crude product was isolated by filtration, dissolved in 40 ml of hot 2N sodium hydroxide and reprecipitated with 4M acetic acid giving 0.16 g (23%) of the pure amino compound; m.p.>300° C.; IR (KBr): 3435, 3350, 3240, 3100-2400, 1690, 1640 cm-1.

Workup

  1. stirringStirring
  2. temperatureThen the mixture was cooled on an ice bath
  3. filtrationfiltered
  4. washThe precipitate was washed with 1 ml of conc. hydrochloric acid
  5. temperatureAfter reflux for 1 h the mixture
  6. temperaturewas cooled on ice

Sources & evidence

ORD record
ord-c032b8f3981b486585cf41ffc3c662ad
Source dataset
uspto-grants-1991_12
Patent number
US05075306

Reaction notes

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