Syntheses of Racemic and Scalemic<i>cis</i>-Chrysanthemic Acid from<i>β</i>,<i>γ</i>-Unsaturated Cyclohexanol
作者:Alain Krief、Stéphane Jeanmart、Humaira Y. Gondal、Adrian Kremer
DOI:10.1002/hlca.201200393
日期:2012.11
2,2,5,5‐Tetramethylcyclohexane‐1,3‐dione is a valuable starting‐material precursor of cis‐chrysanthemic acid. The (1S)‐stereoisomer is a precursor of pyrethrin I, the most active natural insecticide from Chrysanthemum cinerariifolium, whereas the (1R)‐stereoisomer is efficiently transformed to deltamethrin, the most active commercially available pyrethroid insecticide. Several intermediates have been
2,2,5,5-四甲基环己烷-1,3-二酮是顺式菊苣酸的有价值的原料前体。(1 S)-立体异构体是除虫菊酯I的前体,而除虫菊酯I是菊花活性最强的天然杀虫剂,而(1 R)-立体异构体被有效地转化为溴氰菊酯,这是最活跃的市售除虫菊酯杀虫剂。为此,已经确定了几种中间体,并成功使用了各种中间体。