Novel rearrangements of sesquiterpenoid panasinsane derivatives under acidic conditions

New trifluoromethylated sesquiterpenoids: synthesis, rearrangement, and biological activity

The tandem isomerization and trifluoromethylation reactions are a simple, convenient, and atom-economical strategy for the synthesis of various products in high yields from simple substrates.

Enantioselective synthesis of (+)-majusculone

The first enantioselective synthesis of a chamigrane sesquiterpene, (+)-majusculone, has been completed. The quaternary center was generated asymmetrically by alkylidene carbene insertion, with retention of absolute configuration, from a diastereomerically pure ketal.

An unusual intramolecular hydrogen transfer during the hydrolysis of a chloroacetoxy ester

An intramolecular hydrogen transfer from the chloroacetoxy group has been shown to occur in the hydrolysis of the sesquiterpenoid derivative, 5β-chloroacetoxy-15-norpanasinsan-8-one leading to the formation of 5ββ,8α-dihydroxy-15-norpanasinsane.