Catalytic hydrogenation (Pd/C, 10%) of the hexahydro-3-oxophenanthrene (2a) in acidic medium gave the trans-fused octahydrophenanthrene ring system (5b) predominantly, whereas reduction of (2a–c) with LiAlH4 followed by oxidation gave exclusively the cis-fused systems (4a), (4c), and (4e), respectively; the products (4a) and (5b) have been elaborated to the 10βH and 10αH isomers, respectively, of 5
六
氢-3-
氧代
菲(2a)在酸性介质中的催化加
氢(Pd / C,10%)主要产生反式稠合的八
氢菲环体系(5b),而用LiAlH 4还原(2a – c)然后
氧化仅分别给出了顺式融合系统(4a),(4c)和(4e);产品(4A)和(5B)已阐述于10 β分别H和10αH异构体,5,12-二
甲基-5-的β -甾烷-8,11,13-阿
松香三烯三烯-17-
酮。