Reaktion #164580

Reaktionsgleichung

2-amino-5-hydroxy-N-methylbenzamide

Intermediate 32A

2-amino-5-hydroxy-N-methylbenzamide

3-chlorobenzaldehyde

acetic acid

→

2-(3-chlorophenyl)-6-hydroxy-3-methylquinazolin-4(3H)-one

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture heated
2. 2
   Temperaturunder reflux for 23 h
3. 3
   workup.ADDITIONwas added
4. 4
   Temperaturthe reaction heated
5. 5
   Temperaturunder reflux until complete by Ic/ms
6. 6
   TemperaturOn cooling the reaction
7. 7
   Filtrationwas filtered
8. 8
   Sonstigethe filtrate evaporated to dryness

Vorschrift

To a solution of 2-amino-5-hydroxy-N-methylbenzamide (Intermediate 32A) (280 mg, 1.68 mmol) and 3-chlorobenzaldehyde (0.23 mL, 2.02 mmol) in ethanol (10 mL) was added a catalytic amount of acetic acid (0.07 mL) and the mixture heated under reflux for 23 h. The reaction was cooled before manganese (iv) oxide (225 mg, 1.68 mmol) was added and the reaction heated under reflux until complete by Ic/ms. On cooling the reaction was filtered and the filtrate evaporated to dryness to afford 2-(3-chlorophenyl)-6-hydroxy-3-methylquinazolin-4(3H)-one (450 mg, 1.57 mmol).

Quelle