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By Androulla Efeftheriou

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Nat. , Vol. p. p. 024, CHCl) R,~ (176) R, = Cl, R2 = Ra = OH (452) m,p. 242°C m,p. p. p. 132-137°C Recent Insights on the Chemistry and Pharmacology of Withasteroids 15 Contd. p. p. p. p. p. p. p. p. p. p. p. p. p. p. p. p. p. 287-288°C (264) R3 = OH, R4 = OAe, ~16 (318) R3 = R6 = Rll = RI3 = OH (320) RI = R3 = R. p. p. p. p. p. p. 76, MeOH) *All not specified R groups correspond to hydrogen atoms 16 Compo Bio. Nat. , Vol. 24 (277) RI = OMe, R4 = OH, Rs = OAc, L'J. p. p. p. p. p. p. 1, MeOH) (283) R4 = Rn = OH, L'J.

Fastuosa and, daturametelin D (60) from D. metel differ from the other compounds due the lack of the exocyclic double bond. Recently, were isolated from the flowers of D. , 2007). Compounds 77 and 78 possess a seven members ~, y unsaturated lactone located in ring A. R2 = R3 = OH, /1:. p. p. p. p. p. p. 3,5, m,p. p. 0 (c 0,09, CHCI 3) (34) R]&.! 2,5 (36) (37) o (77) R = H, m,p. p. 20, CHCI 3 ) *All not specified R groups correspond to hydrogen atoms Compo Rio. Nat. , Vol. 6 - Extraction, Isolation & Characterization 28 The withanolide 447 isolated from Withania somnifera by Zhao and co-workers (2002), is the first example of a group of withanoIides containing an ether bridge between C-3 and C-6.

P. p. p. p. p. p. p. p. 183- Recent Insights on the Chemistry and Pharmacology of Withasteroids 25 Thejaborosalactones 1 (234), 2 (170),3 (236), 4 (235), 5 (238) and 6 (237), were isolated from the aerial part of Jaborosa runcinata, by Cirigliano and coworkers (1996). All of these metabolites have in their side chain a carboncarbon double bond located in C-17 of the intact steroidal nucleus, an spiranoid y-Iactona in C-23 and an additional ring junction through C-12 and C-17, forming a 17(20)-en-22-keto system.

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