Methanol → Methyl 6-nitro-4-oxo-3,4-dihydroquinazoline-8-carboxylate

HRID 474405Notes

Reaction equation

HRID 474405 reaction equation
[N+:1]([C:4]1[CH:5]=[C:6]2[C:11](=[C:12]([C:14]([OH:16])=[O:15])[CH:13]=1)[N:10]=[CH:9][NH:8][C:7]2=[O:17])([O-:3])=[O:2].S(=O)(=O)(O)O.[OH-].[Na+].[CH3:25]O>>[N+:1]([C:4]1[CH:5]=[C:6]2[C:11](=[C:12]([C:14]([O:16][CH3:25])=[O:15])[CH:13]=1)[N:10]=[CH:9][NH:8][C:7]2=[O:17])([O-:3])=[O:2]

Participants

5

Reactant 4

HCID 887MethanolHCID 1118Sulfuric AcidHCID 14798Sodium HydroxideHCID 1362782956-Nitro-4-oxo-3,4-dihydroquinazoline-8-carboxylic acid

Product 1

HCID 136278294Methyl 6-nitro-4-oxo-3,4-dihydroquinazoline-8-carboxylateYield 84%

Procedure

6-nitro-4-oxo-3,4-dihydroquinazoline-8-carboxylic acid (500 mg, 2.13 mmol) was treated with a solution of sulfuric acid ((1.2 equiv.) in anhydrous MeOH (10 mL) under refluxing overnight. After cooling to rt, 2N NaOH solution was added to the reaction mixture to adjust pH˜8. After removal of MeOH, methyl ester was collected by filtration, and washing with water and as yellow solid in 84% yield. 1HNMR (in DMSO): 3.91 (s, 3H), 8.38 (s, 1H), 8.74 (d, J=2.6 Hz, 1H), 8.88 (d, J=2.6 Hz, 1H). Mass: M+H+: 250.

Workup

  1. temperatureunder refluxing overnight
  2. customAfter removal of MeOH, methyl ester
  3. filtrationwas collected by filtration
  4. washwashing with water and as yellow solid in 84% yield

Sources & evidence

ORD record
ord-527dfebe59234e46be714b21f6553645
Source dataset
uspto-grants-2014_01
Patent number
US08637532B2

Reaction notes

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