Download Comprehensive Bioactive Natural Products, Volume 6: by V. K. Gupta, S.C. Taneja and B.D.Gupta PDF

By V. K. Gupta, S.C. Taneja and B.D.Gupta

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Caulescens var. bipinatifida Recent Insights on the Chemistry and Pharmacology of Withasteroids 23 denominated jaborosalactones 39 (183), 40 (181), 42 (179) and, 12-0ethyljaborosalactone 42 (180), besides two compounds from J. caulescens var. caulescens, jaborosalactone 38 (186) and 18-0-methyljaborosalactone 38 (187). These metabolites have in their structure a hemiketal ring formed between a hydroxyl group in C-21 and a carbonyl in C-12, but they keep a 8lactone in the side chain, characteristic of the withanolides.

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. p. p. p. p. p. 67 Recent Insights on the Chemistry and Pharmacology of Withasteroids 17 Contd. p. p. p. p. p. p. p. p. p. p. p. 251-252°C. p. p. p. p. 03, CHCla> ~2 18 Compo Bio.

P. p. p. p. p. 179-180°C Compo Bio. Nat. , Vol. p. 180-181°C (347) R) = a-OH, R2 = ~-OH (346) Rl' R2 Modified Withanolides The modified withanolides are designated in this way because they are different from most withanolides commonly found. , 200la), show a ketal group at C-26 and a3,5-cyclopropane ring. , 1990). The subtrifloralactones D (98) and E (99), isolated from Deprea subtriflora by Su et al. (2003b), are withasteroids with just 27 carbon atoms (nor-withasteroids) missing the methyl group in C-18, and presenting a carbonyl group in C-12.

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