N-Hydroxyphthalimide → HCID 23353087, compound

Participants

Reaction Steps

33.4 g (0.205 mol) of N-hydroxyphthalimide and 53.8 g (0.205 mol) of triphenylphosphine were added to a solution of 33.1 g (0.186 mol) of 5-hydroxy-1-(4-fluorophenyl)-1-pentine in 430 ml of tetrahydrofuran. 35.7 g (0.205 mol) of diethyl azodicarboxylate were then added in the course of 2.5 hours with monitoring of the temperature (max. 40° C.). Stirring was carried out overnight at room temperature, the mixture was evaporated down under reduced pressure and the residue was taken up with 300 ml of dichloromethane. The solution was washed twice with sodium carbonate solution and once with saturated sodium chloride solution. After drying and evaporating down, the crude product was purified by chromategraphy over silica gel. The eluent used was initially dichloromethane/n-hexane and subsequently pure dichloromethane. Yield: 82%; mp.: 85°-88° C.

Provenance & Evidence