Photochemical transformation of bufadienolide into 14β,21-epoxycholanes via photolytic methanolysis
作者:Takahiro Tanase、Nobutoshi Murakami、Akito Nagatsu、Jinsaku Sakakibara
DOI:10.1039/p19930002217
日期:——
A naturally occurring bufadienolide, proscillaridin 1a, and its aglycone, scillarenin 1b, were subjected to photolysis in MeOH with a high-pressure mercury are lamp to afford novel 14β, 21-epoxy-21-methoxycholadienes 2a–4a and 2b–4b and 14β,21-epoxy -22-methoxycholadienes 5a, 5b, 6a and 6b, along with 14β,21-epoxycholatrienes 7a and 7b. These structures were elucidated from spectroscopical evidence
天然存在的bufadienolide,proscillaridin 1a及其糖苷配基,scillarenin 1b在MeOH和高压汞灯中进行光解,得到新颖的14β,21-环氧-21-甲氧基胆二烯2a-4a,2b-4b和14β ,21-环氧-22-甲氧基胆二烯5a,5b,6a和6b,以及14β,21-环氧胆甾烯7a和7b。从包括NOE实验在内的光谱证据阐明了这些结构。