35068-75-8Relevant articles and documents
Synthesis of cardenolide glycosides and putative biosynthetic precursors of cardenolide glycosides
Luta, Melitta,Hensel, Andreas,Kreis, Wolfgang
, p. 44 - 49 (2007/10/03)
A rapid and efficient procedure for glycosylation of steroids was established using a modified Koenigs-Knorr procedure. Peracetylated β- glycosides were synthesized by reaction of cardenolides, various pregnanes and 23-nor-5,20(22)E-choldienic acid at room temperature with the peracetylated 1-bromo derivatives of D-glucose, D-galactose, D-fucose and cellobiose. Subsequent deprotection was performed by alkaline hydrolysis with sodium methoxide. Structures of the respective glycosides were established by NMR techniques. The complete protocol was shown to be non-destructive at all stages to the sugar moiety and the steroidal nucleus. The γ-unsaturated lactone ring of the cardenolides was shown to remain intact and no formation of C-14 unsaturated compounds was observed.
Cardiac glycosides: 2. Synthesis of glucose and galactose analogs.
Kihara,Yoshioka,Kitatsuji,Hashimoto,Fullerton,Rohrer
, p. 37 - 53 (2007/10/02)
Five cardioactive steroid genins 1a to 5a of widely varying C17 beta-side groups were converted by modified Koenigs-Knorr reactions into the corresponding beta-D-glucosides 1c to 5c and beta-D-galactosides 1e to 5e. The genins included digitoxigenin (3 beta, 14-dihydroxy-5 beta, 14 beta-card-20-(22)-enolide, 1a); (20R)-20, 22-dihydrodigitoxigenin (3 beta, 14-dihydroxy-5 beta, 14 beta, 20R-cardanolde, 2a); 3 beta, 14-dihydroxy-22-methylene-5 beta, 14 beta, 20S-cardanolide (3a); methyl 3 beta, 14-dihydroxy-5 beta, 14 beta-pregn-20(E)-ene-21-carboxylate (4a); and methyl 3 beta, 14-dihydroxy-21-methylene-5 beta, 14 beta-pregnane-21-carboxylate (5a).
Potential anticancer agents. V. Cardiac glycosides of Asclepias albicans (Asclepiadaceae)
Koike,Bevelle,Talapatra,Cordell,Farnsworth
, p. 401 - 405 (2007/10/02)
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