Binap, (A+-)- → (3R)-3-methyl-1-(1H,3H-naphtho[1,8-cd]pyran-6-yl)piperazine

Participants

Reaction Steps

A mixture of 6-bromo-1H,3H-naphtho[1,8-cd]pyran (0.30 g, 1.2 mmol), 2-(R)-methylpiperazine (0.145 g, 1.44 mmol), tris(dibenzylideneacetone)dipalladium(0) (55 mg, 0.06 mmol), rac-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (56 mg, 0.09 mmol) and sodium tert-butoxide (0.162 g, 1.68 mmol) in toluene (5 mL) was heated under reflux for 2 h. The solvent was evaporated in vacuo and the crude mixture purified by column chromatography on silica gel, eluting with dichloromethane/methanol (9:1), to yield (3R)-3-methyl-1-(1H,3H-naphtho[1,8-cd]pyran-6-yl)piperazine as an orange solid.

Provenance & Evidence