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Carbamimidic acid, methyl ester, sulfate (1:1) → 1,4-Dihydro-2-methoxy-6-methyl-4-(3-nitrophenyl)-5-pyrimidinecarboxylic acid, ethyl ester

HRID 1722405
Notes
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Reaction equation

HRID 1722405 reaction equation
[N+:1]([C:4]1[CH:5]=[C:6]([CH:10]=[C:11]([C:17](=O)[CH3:18])[C:12]([O:14][CH2:15][CH3:16])=[O:13])[CH:7]=[CH:8][CH:9]=1)([O-:3])=[O:2].[CH3:20][O:21][C:22]([NH2:24])=[NH:23].OS(O)(=O)=O.C(=O)(O)[O-].[Na+]>CN(C)C=O.O>[CH3:20][O:21][C:22]1[NH:24][C:17]([CH3:18])=[C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])[CH:10]([C:6]2[CH:7]=[CH:8][CH:9]=[C:4]([N+:1]([O-:3])=[O:2])[CH:5]=2)[N:23]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 169039Carbamimidic acid, methyl ester, sulfate (1:1)HCID 367507Ethyl 2-(3-nitrobenzylidene)-3-oxobutanoateHCID 516892Sodium Bicarbonate

Product 1

HCID 139125831,4-Dihydro-2-methoxy-6-methyl-4-(3-nitrophenyl)-5-pyrimidinecarboxylic acid, ethyl esterYield 61.6%

Reagents, catalysts & solvents 2

HCID 962
Water
Solvent
HCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

A mixture of 2-[(3-nitrophenyl)methylene]-3-oxobutanoic acid, ethyl ester (16.46 g, 62.6 mmol), o-methylisourea hydrogen sulfate (14.00 g, 81.4 mmol), and sodium bicarbonate (15.8 g, 18.8 mmol) in dimethylformamide (9.4 ml) was heated at 70° C. (oil bath) under argon overnight. The cooled reaction was diluted with water and extracted with ethyl acetate. The organic phase was washed several times with water, washed with saturated sodium chloride, dried (potassium carbonate) and evaporated. The residue was passed through a pad of silica gel, crystallized from isopropyl ether/hexanes and then triturated with 60% isopropyl ether hexanes (50 ml) to give 1,4-dihydro-2-methoxy-6-methyl-4-(3-nitrophenyl)-5-pyrimidinecarboxylic acid, ethyl ester as light yellow crystals (12.32 g), melting point 101°-103° C.

Workup

  1. customThe cooled reaction
  2. extractionextracted with ethyl acetate
  3. washThe organic phase was washed several times with water
  4. washwashed with saturated sodium chloride
  5. dry with materialdried (potassium carbonate)
  6. customevaporated
  7. customcrystallized from isopropyl ether/hexanes
  8. customtriturated with 60% isopropyl ether hexanes (50 ml)

Sources & evidence

ORD record
ord-257e0764e31c455cb1d0026f6434a4c1
Source dataset
uspto-grants-1989_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04855301

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes