3,4-dihydro-2H-pyran → HCID 54008977, compound

Participants

Reaction Steps

A solution of 10 g (0.06 m) of 2-thiabicyclo[2.2.2]oct-5-en-3-one oxime, 9 g (0.1 m) of 98% dihydropyran, and a catalytic amount of ptoluenesulfonic acid in 30 ml of methylene chloride was heated under reflux overnight. Sodium bicarbonate was added to neutrality. The residue after removal of solvent was purified by dry column chromatography (silica gel-ethyl acetate:hexane::1:1) to give 14.4 g of yellow solid. Recrystallization from etherhexane yielded 10.1 g of the title compound as a white solid, m. 84°-5° C.

Provenance & Evidence