Pheromone synthesis. Part 256: Synthesis of the four stereoisomers of 5,11-dimethylpentacosane, a new sex pheromone component of the male Galleria mellonella (L.), with high stereochemical purities as determined by the derivatization-HPLC analysis of the eight stereoisomers of 5,11-dimethyl-8-pentacosanol
作者:Kenji Mori、Kazuaki Akasaka
DOI:10.1016/j.tet.2015.04.107
日期:2015.6
All the four stereoisomers of 5,11-dimethylpentacosane (>96.8% purity) were synthesized via the stereoisomers of 5,11-dimethyl-8-pentacosanol, whose stereoisomeric compositions could be determined precisely by their low temperature HPLC analysis after derivatization. 5,11-Dimethyl-8-pentacosanol was prepared by a Grignard reaction between 3-methylheptylmagnesium bromide and 4-methyloctadecanal, both
通过5,11-二甲基-8-戊烷醇的立体异构体合成了5,11-二甲基戊烷的所有四种立体异构体(纯度> 96.8%),其衍生化后可以通过其低温HPLC分析精确地确定其立体异构体组成。通过3-甲基庚基溴化镁和4-甲基十八烷之间的格氏反应制备5,11-二甲基-8-戊二十烷醇,两者均由香茅醛的对映体(97-98%ee)制备。可替代地,(- [R)-3-甲基-1-庚醇,可以从甲基(制备- [R)-3-羟基丁酸酯(100%ee)的。Pd / C催化的5-甲基-1-烯烃的氢化导致C-5处的部分消旋。