Efficient Diastereoselective Synthesis of Trifarane-Type Sesquiterpenes, Trifarienols A and B

Diastereoselective total synthesis of trifarienols A and B, trifarane-type sesquiterpenes isolated from the Malaysian Cheilolejeunea trifaria, was achieved via an intramolecular Hosomi−Sakurai reaction of the aldehyde to construct a substituted bicyclo[3.3.1]nonane skeleton having the exo-methylene moiety of the target compounds in one step.