Cholestane- and pregnane-type glycosides from the roots of Tribulus cistoides
作者:Hans Achenbach、Harald Hübner、Melchior Reiter
DOI:10.1016/0031-9422(95)00622-2
日期:1996.2
From the methanolic extract of the roots of Tribuluscistoides the cardioactive saponin-3, which is known to occur in the leaves, was isolated along with tribulosin, a pregnane-typeglycoside and eight new cholestane glycosides. D-(+)-Pinitol and sucrose were major constituents. The structures were established by spectroscopic studies of the isolated compounds, their acetylated derivatives and their
作者:Russell E. Marker、R. B. Wagner、Paul R. Ulshafer、Emerson L. Wittbecker、Dale P. J. Goldsmith、Clarence H. Ruof
DOI:10.1021/ja01201a032
日期:1947.9
Microbial Transformation of Dihydrosarsasapogenin with <i>Mycobacterium </i>sp.
作者:Shoei-Sheng Lee、Jiann-Long Yan、Gong-Yin Lin、K. C. Wang
DOI:10.1021/np970392w
日期:1998.2.1
Microbialtransformation of sarsasapogenin (1) with Mycobacterium sp. (NRRL B-3805) gave 25(S)-neospirost-4-en-3-one (2) as the sole product in 62% yield. Incubation of dihydrosarsasapogenin (3) led to the isolation of seven products in 0.5 (4), 6.6 (5), 5 (6), 16 (7), 1 (8), 1 (9), and 4.5% (10) yields, respectively, while 15% of 3 was recovered. Among these products, 8 and 9 were C22 steroids, and