Tributylstannane → Hydrochloric Acid

Participants

Reaction Steps

To a refluxing solution of 1-benzyl-4-(4-chloro-2-iodo-phenoxymethyl)-1,2,3,6-tetrahydro-pyridine 4c (26.7 g, 0.06 mol) and AIBN (0.05 g, 0.003 mol) in dry benzene was added a solution of Bu3SnH (40 g, 0.137 mol) in benzene (100 mL) over 1 h under nitrogen atmosphere. After addition, the mixture was refluxed for 3 hr and additional AIBN (0.5 g, 0.003 mol) and Bu3SnH (20 g, 0.68 mol) were added. After refluxing for 4 hr, the mixture was concentrated to dryness, and EtOAc (100 mL) and HCl (10%, 40 mL) were added. The precipitate was filtered and washed with petroleum ether to give 2,3-dihydro-1′-benzyl-5-chlorospiro(benzofuran-3,4′-piperidine) as its HCl salt, which was basified by NaHCO3 solution to give 2,3-dihydro-1′-benzyl-5-chlorospiro(benzofuran-3,4′-piperidine) 4d (13 g, 68%).

Provenance & Evidence