Reaktion #4877

Reaktionsgleichung

3-bromo-1-methylpyrrolidine

5-chlorosalicylamide

sodium hydride

salicylamide

→

product

Ausbeute 34.1%

5-Chloro-2-[(1-methyl-3-pyrrolidinyl)oxy]benzamide hemihydrate

Ausbeute 34.1%

Lösungsmittel

dimethylformamide

water

dimethylformamide

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigedid not exceed 20° C
2. 2
   workup.ADDITIONwas added dropwise
3. 3
   Temperaturheated
4. 4
   Temperaturat reflux for 19 hr
5. 5
   Extraktionextracted twice with 250 ml portions of chloroform
6. 6
   ExtraktionThe chloroform was extracted thrice with 500 ml portions of 3N hydrochloric acid
7. 7
   Extraktionextracted with ethyl acetate
8. 8
   TrocknenDrying over magnesium sulfate and evaporation of the ethyl acetate under reduced pressure

Vorschrift

To a cooled suspension of 2.4 g (0.41 mole) sodium hydride in 50 ml of dimethylformamide was added dropwise 17 g (0.1 mole) of 5-chlorosalicylamide dissolved in 50 ml of dimethylformamide at a rate such that the temperature did not exceed 20° C. After addition of the salicylamide was complete, 16.7 g (0.1 mole) of 3-bromo-1-methylpyrrolidine dissolved in 50 ml of dimethylformamide was added dropwise. The reaction mixture was stirred and heated at reflux for 19 hr. The cooled solution was diluted with 250 ml of water and extracted twice with 250 ml portions of chloroform. The chloroform was extracted thrice with 500 ml portions of 3N hydrochloric acid. The aqueous extracts were made alkaline with 50% sodium hydroxide and extracted with ethyl acetate. Drying over magnesium sulfate and evaporation of the ethyl acetate under reduced pressure gave 6 g (23%) of product as a beige solid. The solid was recrystallized from ethyl acetate, m.p. 126°-128° C.

Quelle