Water → HCID 70543710, compound

Participants

Reaction Steps

A solution of 15.0 g (0.04 mol) of the trans-3-hydroxy-4-(3,4-dimethyl-phenoxy)-1-carbobenzyloxy-piperidine described in Example 19 in 100 ml of dimethylformamide is introduced in the course of 30 minutes, at 30°-35°, into a suspension of 2.8 g (0.062 mol) of a 55% strength oily dispersion of sodium hydride in 50 ml of dimethylformamide. The mixture is then warmed to 50° and treated dropwise with 7.16 g (0.055 mol) of 1-chloro-3-fluorobenzene. The reaction mixture is subsequently stirred for 41/2 hours at 60°-70° and then for 15 hours at room temperature, cooled in an ice-water bath and treated with 250 ml of water. The mixture is extracted by shaking with 3 times 250 ml of ethyl acetate and the combined organic phases are washed twice with water, dried over magnesium sulphate and evaporated to dryness, first under a water pump vacuum and then under a high vacuum. The oil which remains behind is dissolved in 100 ml of toluene and the solution is filtered through a layer of silica gel. Elution with a toluene/ethyl acetate mixture (4:1) gives trans-3-(3-chlorophenoxy)-4-(3,4-dimethylphenoxy)-1-carbobenzyloxy-piperidine in the form of a pale yellow oil.

Provenance & Evidence