Biotransformation of Isoflavones by the Larvae of the Common Cutworm (Spodoptera litura)
作者:Koji Takahashi、Hideo Araki、Mitsuo Miyazawa
DOI:10.1248/cpb.54.719
日期:——
Biotransformation of the 5,7,4′-trimethoxyisoflavone (1), 6,7,4′-trimethoxyisoflavone (2), and 7,4′-dimethoxyisoflavone (3) by insects, Spodoptera litura was investigated. Compound 1 was transformed to 5-hydroxy-7,4′-dimethoxyisoflavone (4), 7-hydroxy-5,4′-dimethoxyisoflavone (5) and 4′-hydroxy-5,7-dimethoxyisoflavone (6) by S. litura. Compounds 2 and 3 were hardly metabolized by S. litura. This suggested that compound 1 was converted to compounds 4, 5 and 6 by demethylation at the C-5, C-7 and C-4′ position, respectively.
Total Synthesis and Anti-Inflammatory Evaluation of Osajin, Scandenone and Analogues
作者:Rui Wang、Ran Ma、Ke Feng、Hongchen Lu、Wei Zhao、Hongzhen Jin
DOI:10.3390/ph17010086
日期:——
In this study, the total synthesis of osajin, scandenone and their analogues have been accomplished. The key synthetic steps include aldol/intramolecular iodoetherification/elimination sequence reactions and a Suzuki coupling reaction to assemble the tricyclic core, chemoselective propargylation and Claisen rearrangement reactions to obtain natural compounds. In addition, we also designed and synthesized