Réaction #1895

Équation de réaction

2-amino-5-chloro-2'-hydroxybenzophenone

potassium carbonate

benzyl bromide

→

2-amino-2'-benzyloxy-5-chlorobenzophenone

Solvants

N,N-dimethylformamide

Conditions de réaction

Traitement

1. 1
   ExtractionThe mixture was subjected to extraction with 150 ml of water and 200 ml of ethyl acetate
2. 2
   Lavagethe ethyl acetate layer was washed with water
3. 3
   Séchagedried over anhydrous magnesium sulfate
4. 4
   workup.DISTILLATIONdistilled off under reduced pressure
5. 5
   AutreThe residue was purified by means of silica gel column chromatography (eluent, hexane:ethyl acetate=10:1 to 5:1)

Mode opératoire

In 30 ml of N,N-dimethylformamide was dissolved 5.0 g of 2-amino-5-chloro-2'-hydroxybenzophenone, as obtained in Example 123 (1), to which were added 4.2 g of potassium carbonate and 2.9 ml of benzyl bromide; the mixture was then stirred for 2 hours at room temperature. The mixture was subjected to extraction with 150 ml of water and 200 ml of ethyl acetate, and the ethyl acetate layer was washed with water, dried over anhydrous magnesium sulfate, and distilled off under reduced pressure. The residue was purified by means of silica gel column chromatography (eluent, hexane:ethyl acetate=10:1 to 5:1) to yield 6.4 g of 2-amino-2'-benzyloxy-5-chlorobenzophenone as prism crystals, m.p. 110° to 111° C.

Source