Synthesis and Stereostructure-Activity Relationship of Novel Pyrethroids Possessing two Asymmetric Centers on a Cyclopropane Ring
作者:Takashi Taniguchi、Yasuaki Taketomo、Mizuki Moriyama、Noritada Matsuo、Yoo Tanabe
DOI:10.3390/molecules24061023
日期:——
2R*)-cyanohydrin esters, and (1R*,2S*)-, (1R*,2R*)-ethers; only the (1R*,2R*)-ether was significantly effective. For the enantiomeric (1S,2S)-ether and (1R,2R)-ether, the activity was clearly centered on the (1R,2R)-ether. The present stereostructure‒activity relationship revealed that (i) cyanohydrin esters derived from fenvalerate were unexpectedly inactive, whereas ethers derived from etofenprox were
合成了带有手性氰醇酯或手性醚和环丙烷环上的两个不对称中心的2-甲基环丙烷拟除虫菊酯杀虫剂。这些化合物是分别使用氰戊菊酯中的异丙基和 Etofenprox 类似物(甲基、乙基形式)中的两个二甲基之间的“反向连接方法”设计的。这些合成是通过市售的 (±)-、(R)- 和 (S)-环氧丙烷的开环反应实现的,使用 4-氯苄基氰阴离子作为关键步骤,产品的总产率 >98 % ee。对成对的非手性非对映体 (1R*,2S*)-、(1R*,2R*)-氰醇酯和 (1R*,2S*)-、( 1R*,2R*)-醚类;只有 (1R*, 2R*)-乙醚显着有效。对于对映体 (1S,2S)-醚和 (1R,2R)-醚,活性明显集中在 (1R,2R)-醚上。目前的立体结构-活性关系表明 (i) 氰戊菊酯衍生的氰醇酯出乎意料地无活性,而依托芬普罗衍生的醚具有活性,以及 (ii) (1S,2S)-醚和 (1R,2R) 之间