Water → Ethyl 3-methyl-1-(2-methylpropyl)-2,4-dioxo-1,2,3,4-tetrahydro-thieno[2,3-d]pyrimidine-5-carboxylate

HRID 900735

Reaktionsgleichung

Reaktionsgleichung von HRID 900735
[SH:1][C:2]1[N:7]([CH2:8][CH:9]([CH3:11])[CH3:10])[C:6](=[O:12])[N:5]([CH3:13])[C:4](=[O:14])[CH:3]=1.Br[CH2:16][C:17](=O)[C:18]([O:20][CH2:21][CH3:22])=[O:19].C(=O)([O-])[O-].[K+].[K+].O>CN(C=O)C.C(Cl)Cl.[Ti](Cl)(Cl)(Cl)Cl>[CH3:13][N:5]1[C:4](=[O:14])[C:3]2[C:17]([C:18]([O:20][CH2:21][CH3:22])=[O:19])=[CH:16][S:1][C:2]=2[N:7]([CH2:8][CH:9]([CH3:11])[CH3:10])[C:6]1=[O:12]

Komponenten

8

Edukt 4

HCID 962WaterHCID 11430Potassium CarbonateHCID 66144Ethyl bromopyruvateHCID 52825676-Mercapto-3-methyl-1-(2-methylpropyl)-2,4(1H,3H)-pyrimidinedione

Produkt 1

HCID 5282568Ethyl 3-methyl-1-(2-methylpropyl)-2,4-dioxo-1,2,3,4-tetrahydro-thieno[2,3-d]pyrimidine-5-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 24193Titanium TetrachlorideKatalysatorHCID 6228DimethylformamideLösungsmittelHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

6-Mercapto-3-methyl-1-(2-methylpropyl)-pyrimidine-2,4(1H,3H)-dione (49.5 g) was dissolved in dry DMF (900 ml) and ethyl bromopyruvate (30 ml) was added, and then with stirring anhydrous potassium carbonate (15.954 g) was also added. The mixture was stirred at room temperature for 5 h, and then poured into water (5 L). The aqueous solution was acidified with dil hydrochloric acid, and then extracted thoroughly with ethyl acetate. The organic extract was dried (MgSO4) and evaporated at high vacuum to leave a semisolid mass. A portion of this semisolid mass (24 g) was dissolved in methylene chloride (500 ml) and cooled in an ice-bath under an atmosphere of nitrogen. With efficient stirring titanium tetrachloride (13.5 ml) was slowly added. The reaction mixture was stirred 1 h in the ice-bath and then 3 h at room temperature. The reaction mixture was poured slowly into vigorously stirred ice-water (1.5 L), and then the resulting suspension was extracted into methylene chloride. After drying the organic solvent was concentrated in vacuo, and the residue was chromatographed (SiO2/1:1 ethyl acetate-isohexane) to afford the sub-title compound as a pale yellow solid (15 g).

Aufarbeitung

  1. extractionextracted thoroughly with ethyl acetate
  2. extractionThe organic extract
  3. dry with materialwas dried (MgSO4)
  4. customevaporated at high vacuum
  5. customto leave a semisolid mass
  6. temperaturecooled in an ice-bath under an atmosphere of nitrogen
  7. additionwas slowly added
  8. custom3 h
  9. customat room temperature
  10. extractionthe resulting suspension was extracted into methylene chloride
  11. customAfter drying the organic solvent
  12. concentrationwas concentrated in vacuo
  13. customthe residue was chromatographed (SiO2/1:1 ethyl acetate-isohexane)

Quellen und Nachweise

ORD-Eintrag
ord-c14fd4ca5aa54af1b9b253ff9abb60b3
Quelldatensatz
uspto-grants-2008_04
Patentnummer
US07361660B2

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