Stereoselective synthesis of 4α-acyloxy-2α/β-bromopodophyllotoxin derivatives as insecticidal agents
作者:Yong Guo、Lingling Fan、Juanjuan Wang、Chun Yang、Huan Qu、Hui Xu
DOI:10.1016/j.tet.2012.10.073
日期:2013.1
To find new natural products-based insecticidal agents, and substantially extend our previous work, we have designed and stereoselectively synthesized 4α-acyloxy-2α/β-bromopodophyllotoxin derivatives from podophyllotoxin. Interestingly, 4α-acyloxy-2α-bromopicropodophyllotoxins were easily converted to a more rigid compound 14 by an intramolecular Friedel–Crafts alkylation reaction in the presence of
为了找到新的基于天然产物的杀虫剂,并大大扩展了我们以前的工作,我们从鬼臼毒素中设计并立体选择性地合成了4α-酰氧基-2α/β-溴鬼臼毒素衍生物。有趣的是,当BF 3 ·Et 2 O存在时,当反应时间延长至4–18 h时,通过分子内Friedel–Crafts烷基化反应,很容易将4α-酰氧基-2α-溴微假鬼臼毒素转化为刚性更高的化合物14。化合物5g,6h,6i和14的杀虫活性比太生丹宁(得自Melia azedarach的商业杀虫剂)显示出更有希望和更明显的杀虫活性。,对付Mythimna separata的三龄前幼虫。