Acetyl chloride → Methyl 1-acetyl-5-[4-(2-hydroxyethyl)phenyl]piperidine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of 5.58 g (9.33 mmol, purity 44%) of the compound from Example 56A in dichloromethane (80 ml) was admixed with 2.60 ml (1.89 g, 18.7 mmol) of triethylamine and then cooled to 0° C. At this temperature, 0.33 ml (0.37 g, 4.67 mmol) of acetyl chloride was added dropwise and the mixture was stirred for 2 h. A further 0.13 ml (0.15 g, 1.86 mmol) of acetyl chloride was added and the mixture was stirred for 1 h. Subsequently, the reaction solution was washed with aqueous 1 N hydrochloric acid, and the organic phase was dried over magnesium sulphate, filtered and concentrated under reduced pressure. The residue was purified by means of column chromatography (silica gel, dichloromethane/methanol 30:1), and the crude product obtained was purified once more by means of preparative HPLC. Yield: 1.17 g (41% of theory)

Provenance & Evidence