Synthesis of New Terpene Skeletons by Chemical Cyclization of Epoxy Olefins

Abstract

Abstract Tin(IV) chloride catalyzed cyclization of the epoxy olefin (±)‐ 7 gave the octahydroazulene derivative (±)‐ 9 , the structure of which was solved by X‐ray analysis of its derivative (±)‐ 11 . Titanium(IV) chloride catalyzed cyclization of the epoxy triene (±)‐ 18 yielded the hydrobenz[ e ]indene derivative (±)‐ 19 as a mixture of stereoisomers. The structure of (±)‐ 19 was solved by X‐ray analyses of its derivatives (±)‐ 20 and (±)‐ 21 . magnified image