Sodium hydride → HCID 22452066, compound

Participants

Reaction Conditions

Reaction Steps

3.64 g of sodium hydride (60%) are added batchwise to 13.00 g of 2-(tetrahydropyran-2-yloxy)-ethanol in 250 ml of tetrahydrofuran while cooling with an ice bath. Then the reaction mixture is heated to about 30-40° C. in a water bath and stirred for 15 minutes. It is then cooled again in the ice bath and combined with 15.60 g of 4-[(3-chloro-4-fluoro-phenyl)amino]-7-fluoro-6-nitro-quinazoline in 50 ml of tetrahydrofuran. The reaction mixture immediately turns dark red. After 10 minutes the ice bath is removed and the reaction mixture is stirred for one hour at ambient temperature. Then a total of 1.00 g of sodium hydride is added and stirring is continued for a further 1.5 hours at 50° C. until the reaction is complete. For working up about 200 ml of tetrahydrofuran are distilled off using a rotary evaporator. The residue is added to 1 litre of ice-water and neutralised with citric acid. The aqueous phase is extracted thoroughly with ethyl acetate. The combined organic phases are washed with 250 ml of semi-saturated sodium chloride solution, dried over magnesium sulphate and evaporated down. A yellow precipitate is formed, which is suction filtered and dried in the desiccator. The mother liquor is again evaporated down. The solid yellowish flask residue is triturated with tert.butyl methyl ether, suction filtered and also dried in the desiccator.

Provenance & Evidence