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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
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1722405
[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
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 3

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

Produkt 1

HCID 139125831,4-Dihydro-2-methoxy-6-methyl-4-(3-nitrophenyl)-5-pyrimidinecarboxylic acid, ethyl esterAusbeute 61,6 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962
Water
Lösungsmittel
HCID 6228DimethylformamideLösungsmittel

Reaktionsbedingungen

Temperatur
70 °C

Versuchsvorschrift

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.

Aufarbeitung

  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)

Quellen und Nachweise

ORD-Eintrag
ord-257e0764e31c455cb1d0026f6434a4c1
Quelldatensatz
uspto-grants-1989_08
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US04855301

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