Reaktion #161336

Reaktionsgleichung

3-amino-4-phenylaminobenzoic acid

benzyloxyacetyl chloride

→

title compound

Ausbeute 86.8%

1-phenyl-2-(phenylmethoxy)methylbenzimidazole-5-carboxylic acid

Ausbeute 86.8%

Lösungsmittel

toluene

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA 4-neck flask equipped with a reflux condenser
2. 2
   Temperaturthis was refluxed
3. 3
   Extraktionwas extracted with dilute aqueous sodium hydroxide solution (10%, 100 mL)
4. 4
   WaschenThis was washed with toluene
5. 5
   Sonstigeafter separating the dark orange aqueous layer
6. 6
   Temperaturthis was cooled (5 to 10° C.), and concentrated hydrochloric acid (12 M)
7. 7
   workup.ADDITIONwas added to the liquid
8. 8
   Sonstigeto give pH 4
9. 9
   FiltrationThe precipitated crystals were filtered off
10. 10
    Waschenwashed with distilled water
11. 11
    Sonstigedried under reduced pressure
12. 12
    Temperaturwith heating

Vorschrift

A 4-neck flask equipped with a reflux condenser was charged with 3-amino-4-phenylaminobenzoic acid (see Synthesis Example 1-2) (3.09 g, 13.54 mmol) and anhydrous toluene (45 mL) and this was refluxed. To this was added dropwise benzyloxyacetyl chloride (5 g, 27.08 mmol) in toluene solution (approx. 3 mL) over approx. 10 minutes. This was stirred under these conditions for 15 hours. This was allowed to cool to room temperature, and was extracted with dilute aqueous sodium hydroxide solution (10%, 100 mL). This was washed with toluene, and after separating the dark orange aqueous layer, this was cooled (5 to 10° C.), and concentrated hydrochloric acid (12 M) was added to the liquid to give pH 4. The precipitated crystals were filtered off, washed with distilled water, and dried under reduced pressure with heating to yield the title compound (4.21 g, 86.8% yield) as a light purple powder.

Quelle