Domino intramolecular Diels-Alder reactions to construct a 6/6/5/5 fused tetracyclic framework

A concise approach to the tricyclic framework of longipinane- and ent-longipinane-type sesquiterpenoids

A general strategy for the synthesis of the common 6,6-dimethyltricyclic[5.4.0.0^2,8]undecane framework of longipinane- and ent-longipinane-type sesquiterpenoids has been successfully developed.

Revision of the Phytochemistry of Eremophila sturtii and E. mitchellii

Eremophila sturtii and E. mitchellii are found in the arid and temperate regions of Australia and, because of their similar appearances, are often confused. Previous phytochemical investigations have described mitchellene sesquiterpenes (1-5) reported from E. mitchellii but are here demonstrated to be from E. sturtii. A previous study that described serrulatic acids (16 and 17) from a species reported as E. sturtii actually used E. mitchellii. In addition, two new C-15 modified analogues, mitchellenes F (14) and G (15), were isolated from E. sturtii. The absolute configuration of 14 was determined with the first X-ray structure of a compound with the mitchellene skeleton.