HCID 178488043, Verbindung → HCID 178524063, Verbindung
Reaktionsgleichung
C[O:2][C:3]1[CH:12]=[CH:11][C:10]2[NH:9][C:8]3=[CH:13][C:14]([C:16]([OH:18])=[O:17])=[N:15][N:7]3[C:6](=[O:19])[C:5]=2[CH:4]=1>Br.C(O)(=O)C.O>[OH:2][C:3]1[CH:12]=[CH:11][C:10]2[NH:9][C:8]3=[CH:13][C:14]([C:16]([OH:18])=[O:17])=[N:15][N:7]3[C:6](=[O:19])[C:5]=2[CH:4]=1Komponenten
5
Reagenzien, Katalysatoren, Lösungsmittel 3
Versuchsvorschrift
A suspension of 4,9-dihydro-7-methoxy-9-oxo-pyrazolo[5,1-b]quinazoline-2-carboxylic acid (2.0 g; 0.0077 mole) in 48% hydrobromic acid (30 ml) and glacial acetic acid (50 ml) is refluxed for 23 hrs. The mixture is cooled and then diluted with water (25 ml). The product, which precipitates out, is collected by filtration and recrystallized from DMF-Ether (1:1, 90 ml). Yield 1.1 g; mp 285°-286° C. (d).
Aufarbeitung
- temperatureis refluxed for 23 hrs
- temperatureThe mixture is cooled
- customThe product, which precipitates out
- filtrationis collected by filtration
- customrecrystallized from DMF-Ether (1:1, 90 ml)
Quellen und Nachweise
- ORD-Eintrag
- ord-18fa4349312740089f5bb05920fe843a
- Quelldatensatz
- uspto-grants-1981_04
- Patentnummer
- US04261996
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