Diterpenes from Solidago rugosa

Investigation of the roots and aerial parts of Solidago rugosa afforded the known diterpenes kolavenol, hardwickiic acid, (-)-kaur-16-en-19-oic acid, (+)-manool, (+)-3 beta-hydroxymanool, manoyl oxide and ent-abietic acid. In addition, the new labdane diterpene (+)-18-tigloyloxymanool and four new ent-abietanes were obtained. The structures of all known and new compounds were elucidated by spectroscopic methods, especially high-field 1H and 13C NMR, and inverse 1H-13C-correlation techniques, as well as chemical transformations. Six diterpenes were tested against Mycobacterium tuberculosis and M. avium, but showed no significant activities with minimum inhibitory concentrations of > 100 micrograms ml-1.