The UV.-isomerisation of 11-oxo-14β,17α-pregnane 9 to the 11,19-cyclo-derivative 11 is described. In addition the Pb(OAc)4-fragmentation of photoproduct 11 was investigated. 11 yielded besides the expected 11-oxo-19-hydroxy-pregnane 18 the novel 9,11-seco-11,19-cyclosteroid 19. The structure of 19 was established by chemical transformations and subsequently confirmed by X-ray analysis [2].
描述了11-氧代-14β,17α-孕烯9到11,19-环衍
生物11的UV-异构化。另外,研究了光产物11的Pb(OAc)4片段。11得到除了预期的11-氧代-19-羟基-孕甾18的新颖9,11-断- 11,19-cyclosteroid 19。19的结构通过
化学转化建立,随后通过X射线分析确认[2]。