1-Benzyl-4-piperidone → 1'-Benzyl-6-bromospiro[chroman-2,4'-piperidin]-4-one

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Reaction Steps

A mixture of 2-hydroxy-5-bromoacetophenone (5.85 g, 27.2 mmol), N-benzyl-4-piperidone (5.14 g, 27.21 mmol) and pyrrolidine (1.11 ml, 13.60 mmol) in MeOH (100 ml) was heated to reflux. After 11 h, the solvent was removed under vacuum and the crude mixture was purified by column chromatography (eluent: hexane/AcOEt 90:10 to 70:30) to give 1′-benzyl-6-bromo-spiro[chromane-2,4′-piperidine]-4-one (7.0 g) as a yellow solid.

Provenance & Evidence