Acetyl chloride → HCID 12788523, compound

Participants

Reaction Steps

A solution of 1.4 ml of acetyl chloride in 75 ml of chloroform is added dropwise under nitrogen over a 15-minute period to a solution of 5.05 g of the free base of cis-4-(4-aminophenoxy)-1-methyl-3-phenylpiperidine of Example 8 in 150 ml of dry chloroform containing 2.74 ml of triethylamine. The pot temperature reaches a maximum of 28° C. The reaction is complete in 30 minutes. The chloroform solution is washed with 10% aqueous NaOH solution, then with saturated aqueous NaCl solution, dried over anhydrous Na2SO4 and concentrated in vacuo to a foam which solidifies upon trituration with hexane. The hexane mixture is briefly heated to boiling, then cooled to room temperature and allowed to stand for 30 minutes before filtering. A crude solid results, mp s 172°, 173°-175° C. Recrystallization from toluene affords cis-4-(4-acetamidophenoxy)-1-methyl-3-phenylpiperidine, mp 174.5°-176.5° C.

Provenance & Evidence