Hydrogen Bromide → 3-Bromopiperidin-4-one hydrobromide

Participants

Reaction Steps

4.7 mL 33% HBr in acetic acid and 11.4 g bromine in 30 mL acetic acid were added slowly to a stirred solution of 10 g piperidin-4-one in 60 mL acetic acid at RT. The reaction mixture was stirred for additional 45 min at ambient temperature and the acetic acid was completely removed under reduced pressure. The residue was dissolved in 200 mL acetone and refluxed for 1 h, cooled, filtered and washed with acetone and dried to give 15.2 g of the desired product, (M+H)+: 180.

Provenance & Evidence