Five new triterpenoids occurring in various Lycopodium plants were shown to be 16-oxoserratenediol (1a), 16-oxo-21-episerratenediol (2a), 16-oxodiepiserratenediol (3a), 16-oxoserratriol (6a), and 16-oxolycoclavanol (7a) respectively, by spectral and chemical means, and the structures assigned were finally confirmed by partial syntheses from the corresponding deoxo-compounds. Potential utility of the solvent shift experiment in NMR and the resulting TH-effect for structural and stereochemical problems was indicated. A conjugated ketone isolated from L. cernuum by Inubushi, et al. was identical with the synthetic 16-oxo-21-episerratriol (19c).
通过光谱和
化学方法,证明了五种出现在不同狼尾草植物中的新三
萜类化合物分别是 16-氧代山芝麻烯二醇(1a)、16-氧代-21-表山芝麻烯二醇(2a)、16-氧代二表山芝麻烯二醇(3a)、16-氧代山芝麻三醇(6a)和 16-氧代聚黄烷醇(7a),并通过相应脱氧化合物的部分合成最终确认了所指定的结构。核磁共振中的溶剂转移实验以及由此产生的 TH 效应对结构和立体
化学问题的潜在作用得到了证实。Inubushi 等人从 L. cernuum 分离出的共轭酮与合成的 16-oxo-21-episerratriol (19c) 相同。