Palladium catalyzed intramolecular cascade type cyclizations: interesting Approach towards naphthoquinone derivatives having an O-containing heterocyclic skeleton

Abstract

Important naphthoquinones fused with an O-containing six-, seven- and eight-membered ring along with one tetracyclic compound, which are normally difficult to construct, have been synthesized using intramolecular Heck reaction where 6-exo trig, 7-endo trig and 8-endo trig cyclizations take place, respectively.