作者:_ Atta-ur-Rahman、Muhammad Yousaf、Waseem Gul、Samina Qureshi、M. Iqbal Choudhary、Wolfgang Voelter、Antje Hoff、Fricke Jens、Aniqa Naz
DOI:10.3987/com-98-8208
日期:——
Phytochemical studies on the whole plant of Withania coagulans have resulted in the isolation of five new withanolides, namely coagulins H, I, J, K and L (1-5). Their structures have been established as (17S,20S,22R)-5 alpha,6 beta, 14 alpha, 15 alpha, 17,20-hexahydroxy-1-oxowitha-2,24-dienolide (1), (14R, 17S, 20S,22R)-5 alpha,6 beta,17-trihydroxy-14,20-epoxy-1-oxowitha-2,24-dienolide (2), (14R, 17R,20R,22R)-3 beta,27-dihydroxy-14,20-epoxy-1-oxowitha-5,24-dienolide (3), (14R, 17R,20R,22R)-14, 20-epoxy-3 beta-(O-beta-D-glucopyranosyl)-1-oxowitha-5,24-dienolide (4) and (14R, 17S,20S,22R)-14, 17,20-trihydroxy-3 beta-(O-beta-D-glucopyranosyl)-1-oxowitha-5,24-dienolide (5), respectively on the basis of spectroscopic techniques.