Steroids limonoids

A limonoid from Azadirachta indica (Neem) Steroids... 

Other studies show the presence of a diversity of compounds other than limonoids as defenses in the tissues of Meliaceae. Woody tissues of Trichilia trifolia afforded three novel dolabellanes with flexible Curing structures. These substances were very active antifeedants in the Sitophilus bioassay (Ramirez et al., 2000). T. martiana seeds yielded large amounts of 2-((Z,Z)-6,9-heptadecadienyl)furan. T. hirta and T. americana bark have yielded novel steroids by insect bioassay-guided isolation and application of a nanoprobe nuclear magnetic resonance (NMR) technique for structure elucidation (Chaurest etal.,1996). Compounds isolated included hydroxyandrosta-l,4-diene-3,16-dione (Fig. 1.4) and derivatives. However, studies by Wheeler et al. (2001) suggest that other unidentified compounds may also be... 

From the point of interest of antifeedants, triterpenoids can be divided into three classes, depending on the number of carbon atoms in the skeleton there are full C-30 triterpenes, C-26 limonoids, and C-20 quassins. In addition, there are saponins, which can have either a triterpenoid or a steroid skeleton. Interesting and powerful antifeedants are found in each class. 

Steroidal Alkaloids from Solanum umbelliferum Marine Diterpenoids from Eunicea toumeforti Limonoids from Trichilia emetica... 

Synthesis of polyoxysteroids of Achlya (steroid y- and 8-lactones) 98KPS3. Synthetic studies on limonoids 98YGK1014. 

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