HCID 178488043, Verbindung → HCID 178524063, Verbindung

HRID 443822Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 443822
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]=1

Komponenten

5

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

  1. temperatureis refluxed for 23 hrs
  2. temperatureThe mixture is cooled
  3. customThe product, which precipitates out
  4. filtrationis collected by filtration
  5. 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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