Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and ...Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.展开更多
Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2)...Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2) and 3-O-6-deoxy-3-O-methyl-β-D-allopyranosyl-(1→4)-β-D- oleandropyranosyl-tenacigenin C (3). The structure of the known aglycon tenacigenin C was revised as 5α, 9α, 17β-pregnane-3β, 8β, 11α, 12β, 14β-pentanol-20-one. Compound 3 is the first reported glycoside of tenacigenin C.展开更多
文摘Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.
文摘Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2) and 3-O-6-deoxy-3-O-methyl-β-D-allopyranosyl-(1→4)-β-D- oleandropyranosyl-tenacigenin C (3). The structure of the known aglycon tenacigenin C was revised as 5α, 9α, 17β-pregnane-3β, 8β, 11α, 12β, 14β-pentanol-20-one. Compound 3 is the first reported glycoside of tenacigenin C.
