Reaktion #325377

Reaktionsgleichung

Water

2-ethyl-3-propyl-3H-quinazolin-4-one

sodium acetate

bromine

→

product

Ausbeute 92.3%

2-(1-Bromo-ethyl)-3-propyl-3H-quinazolin-4-one

Ausbeute 92.3%

Lösungsmittel

acetic acid

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter addition
2. 2
   Temperaturwas heated
3. 3
   Temperaturto reflux for 2 hours
4. 4
   Extraktionthe mixture extracted with dichloromethane
5. 5
   WaschenThe organic layer was then washed with 10% sodium bisulfite solution, water
6. 6
   Trocknendried over magnesium sulfate
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated

Vorschrift

To a solution of 2-ethyl-3-propyl-3H-quinazolin-4-one (125 mg, 0.58 mmol) and sodium acetate (48 mg, 0.58 mmol) in glacial acetic acid (1 mL) cooled in an ice bath was added dropwise a solution of bromine (29.8 μL, 0.58 mmol) in glacial acetic acid (0.5 mL). After addition was complete the reaction was heated to reflux for 2 hours. Water was then added to the solution and the mixture extracted with dichloromethane. The organic layer was then washed with 10% sodium bisulfite solution, water and then dried over magnesium sulfate, filtered and concentrated to yield the product as a brown oil (158 mg, 92%). 1H NMR (CDCl3) δ 1.05 (t, 3H, J=7.3 Hz), 1.66 (m, 1H), 1.91 (m, 1H), 2.19 (d, 3H, J=6.3 Hz), 3.89 (m, 1H,), 4.53 (m, 1H,), 5.04 (q, 1H, J=6.6 Hz), 7.49 (t, 1H, J=7.3 Hz), 7.73 (m, 2H), 8.27 (d, 1H, J=8.4 Hz).

Quelle