RING-EXPANSION OF 7-CHLORO-2-OXABICYCLOOCT-4-EN-3-ONES TO 2H-OXOCIN-2-ONES WITH BASE. FORMATION OF A NEW OXACYCLOOCTATRIENONE SYSTEM

Article abstract of DOI:10.1246/cl.1984.1503

The treatment of chlorinated 2-oxabicyclo<4.2.0>oct-4-en-3-ones, which are photoadducts between 4,6-dimethyl-2-pyrone and chloroethylenes, with a base gives new 2H-oxocin-2-ones in good yields.This provides the first example for preparation of a monocyclic oxacyclooctatrienone system.