Reaktion #987150

Reaktionsgleichung

methanol

boron tribromide

5,5-dimethyl-1-(6-methoxyquinolin-4-ylmethyl)-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione

NaHCO3

→

5,5-dimethyl-1-(6-hydroxyquinoline-4-ylmethyl)-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione

Ausbeute 67.4%

Lösungsmittel

CH2Cl2

dichloromethane

CH2Cl2

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONare added
2. 2
   SonstigeAfter separation of the phases
3. 3
   Trocknenthe organic phase is dried over sodium sulfate
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated under reduced pressure
6. 6
   SonstigeThe beige-colored foam obtained
7. 7
   Sonstigeis purified by flash chromatography (SiO2, EtOAc as eluent, Ar)
8. 8
   workup.ADDITIONThe fractions containing the product
9. 9
   Einengenare concentrated under reduced pressure

Vorschrift

6 ml of a 1M solution of boron tribromide in CH2Cl2 are added to a solution of 0.26 g of 5,5-dimethyl-1-(6-methoxyquinolin-4-ylmethyl)-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione in 40 ml of dichloromethane, under an inert atmosphere of argon at a temperature in the region of 0° C. The reaction medium is stirred at a temperature in the region of 20° C. for 16 hours. 5 ml of methanol are added dropwise. After stirring for 30 minutes at this temperature, 50 ml of water, 30 ml of CH2Cl2 and 10 ml of saturated NaHCO3 are added. After separation of the phases by settling, the organic phase is dried over sodium sulfate, filtered and then concentrated under reduced pressure. The beige-colored foam obtained is purified by flash chromatography (SiO2, EtOAc as eluent, Ar). The fractions containing the product are concentrated under reduced pressure. 0.17 g of 5,5-dimethyl-1-(6-hydroxyquinoline-4-ylmethyl)-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione is thus obtained, the characteristics of which product are as follows:

Quelle