CYCLOSADOL, ISOCYCLOSADOL, AND OTHER RELATED TRITERPENE ALCOHOLS OBTAINED FROM 24-METHYLENECYCLOARTANOL BY ACID-CATALYZED ISOMERIZATION.

Article abstract of DOI:10.1246/bcsj.57.1425

The acid-catalyzed isomerization of 24-methylenecycloartanol with sulfuric acid afforded cyclosadol (23E- DELTA **2**3), isocyclosadol (23Z- DELTA **2**3), and other isomers, including lanostane- and cucurbitane-type isomers with (23E)- and (23Z)- DELTA **2**3- and DELTA **2**4-unsaturated side chains. The phytochemical significance of the isomers is discussed.