Methanesulfonic Acid → 6-(4-Chloro-2,6-dimethoxyphenyl)piperidin-2-one

Participants

Reaction Conditions

Reaction Steps

A mixture of commercially available 1-chloro-3,5-dimethoxybenzene (1.243 g; 6.98 mmol), P2O5(991 mg; 6.98 mmol), and methanesulfonic acid (5.659 g; 58.89 mmol) was treated with commercially available (S)-6-oxopiperidine-2-carboxylic acid (1.000 g; 6.98 mmol), and the resulting mixture was heated to 100° C. for 30 min. After cooling to rt, water was added, and the resulting solution was extracted with DCM. The mixed organic layers were dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. Purification by preparative HPLC afforded 6-(4-chloro-2,6-dimethoxyphenyl)piperidin-2-one as a colorless solid. LC-MS (conditions E): tR=0.61 min.; [M+H]+: 270.26 g/mol.

Provenance & Evidence