Methanol → 4-(3,4-Dimethoxyphenyl)-2-(2-hydroxyethyl)-6,7-dimethoxyquinazoline

HRID 862640Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 862640
CO.[CH3:3][O:4][C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][C:14]=1[O:15][CH3:16])[N:11]=[C:10]([CH2:17][C:18](OC)=[O:19])[N:9]=[C:8]2[C:22]1[CH:27]=[CH:26][C:25]([O:28][CH3:29])=[C:24]([O:30][CH3:31])[CH:23]=1.[BH4-].[Na+].O1CCCC1>O>[CH3:3][O:4][C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][C:14]=1[O:15][CH3:16])[N:11]=[C:10]([CH2:17][CH2:18][OH:19])[N:9]=[C:8]2[C:22]1[CH:27]=[CH:26][C:25]([O:28][CH3:29])=[C:24]([O:30][CH3:31])[CH:23]=1

Komponenten

6

Edukt 4

HCID 887MethanolHCID 8028TetrahydrofuranHCID 4311764Sodium borohydrideHCID 212240726,7-Dimethoxy-4-(3,4-dimethoxyphenyl)quinazoline-2-acetic acid methyl ester

Produkt 1

HCID 220975944-(3,4-Dimethoxyphenyl)-2-(2-hydroxyethyl)-6,7-dimethoxyquinazolineAusbeute 81 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

Methanol (15 ml) was added dropwise under reflux to a mixture of methyl 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-quinazoline-2-acetate (4.0 g), sodium borohydride (1.9 g) and tetrahydrofuran (80 ml). The mixture was stirred under reflux for 2 hours, poured into water and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried over magnesium sulfate. The solvent was evaporated under reduced pressure to give 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-(2-hydroxyethyl)quinazoline (3.0 g, 81%) which was then recrystallized from ethyl acetate. Colorless needle crystals. mp. 165°-166° C.

Aufarbeitung

  1. temperatureunder reflux for 2 hours
  2. extractionextracted with ethyl acetate
  3. washThe ethyl acetate layer was washed with water
  4. dry with materialdried over magnesium sulfate
  5. customThe solvent was evaporated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-32f7a87fec8e4175a65a37c756095239
Quelldatensatz
uspto-grants-1998_02
Patentnummer
US05719157

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