Gamma-Butyrolactone → 5-(2-hydroxyethyl)-2-thiouracil

HRID 859949Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 859949
C(OCC)=O.[C:6]1(=[O:11])[O:10][CH2:9][CH2:8][CH2:7]1.[CH3:12]C(C)([O-])C.[K+].[NH2:18][C:19]([NH2:21])=[S:20]>CCOCC.O1CCCC1.CC(O)C>[OH:10][CH2:9][CH2:8][C:7]1[C:6](=[O:11])[NH:18][C:19](=[S:20])[NH:21][CH:12]=1

Komponenten

8

Edukt 4

HCID 7302Gamma-ButyrolactoneHCID 8025Ethyl formateHCID 2723790ThioureaHCID 23665647Potassium tert-butoxide

Produkt 1

HCID 36146775-(2-hydroxyethyl)-2-thiouracil

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 3283Diethyl EtherLösungsmittelHCID 3776IsopropanolLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

A solution of ethyl formate (33.1 ml, 2.1 equiv) and γ-butyrolactone (15 ml, 1 equiv) in ether (400 ml) was added dropwise with stirring to a solution of potassium t-butoxide (52.5 g, 2.4 equiv) in tetrahydrofuran (400 ml). The mixture was allowed to warm to room temperature, and stirred overnight. The solvent was removed in vacuo, 2-propanol (600 ml) and thiourea (29.7 g, 2 equiv) were added, and the mixture was heated to reflux for 5 h. After cooling to room temperature, the precipitate was filtered off, dissolved in water (500 ml), and washed twice with ether. The aqueous solution was acidified to pH5.5 with acetic acid, and the resulting precipitate was filtered off, washed thoroughly with water, and dried in vacuo; yield 23.85 g. 1H-NMR (d6-DMSO) δ 2.36 (2H, t), 3.47 (2H, m), 4.57 (1H, m), 7.24 (1H, s), 12.2 & 12.4 (each 1H, br s); MS (APCI−) found (M−H)=171; C6H8N2O2S requires 172.

Aufarbeitung

  1. additionwere added
  2. temperaturethe mixture was heated
  3. temperatureto reflux for 5 h
  4. temperatureAfter cooling to room temperature
  5. filtrationthe precipitate was filtered off
  6. dissolutiondissolved in water (500 ml)
  7. washwashed twice with ether
  8. filtrationthe resulting precipitate was filtered off
  9. washwashed thoroughly with water
  10. customdried in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-da6e712bcc594b74b33c9d59b42acf10
Quelldatensatz
uspto-grants-2006_12
Patentnummer
US07153861B2

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