Azobisisobutyronitrile → 2-Phenyl-1,6-dioxaspiro[2.4]heptan-7-one

Participants

Reaction Steps

To a solution of 3-[1-phenyl-meth-(E)-ylidene]-dihydro-furan-2-one (21a) (4.0 g, 22.9 mmol) and 3-chloroperoxybenzoic acid (6.18 g, 27.6 mmol) in 1,2-dichloroetheane (70 mL) was added catalytic amount of AIBN (50 mg) at 80° C. and refluxed in the dark for 6 h. The resulting solution was cooled and filtered, the solvent was removed under reduced pressure, and the residue dissolved in dichloromethane. The organic phase was washed consecutively with saturated aqueous solutions of NaHCO3 (20 mL), KI (20 mL), Na2S2O3 (20 mL), and NaHCO3 (20 mL) then dried over anhydrous MgSO4 and evaporated under reduced pressure. Product was purified by silica gel flash chromatography using ethyl acetate:petroleum ether (1:4) gave 2.62 g in 60% yield of the title compound.

Provenance & Evidence