Expedient synthesis of quadrilure antipodes, the pheromone of square-necked grain beetle
作者:A.S Pawar、S Chattopadhyay
DOI:10.1016/0957-4166(95)00031-j
日期:1995.2
title pheromone, (E)-3-methyl-7-acetoxynon-3-ene (I) have been synthesized in high enantiomeric excess via a stereoselective route. Thus, easily accessible, 3-methylpent-1-en-3-ol (2) was converted via a Claisen orthoester rearrangement to the ester (3) with exclusive (E)-geometry. Its derivatization to the aldehyde (5) followed by reaction with ethylmagnesium bromide gave the racemic pheromone alcohol
标题信息素(E)-3-甲基-7-乙酰氧基壬-3-烯(I)的两种对映异构体均通过立体选择性途径以高对映体过量的方式合成。因此,通过克莱森原酸酯重排将易于获得的3-甲基戊-1-烯-3-醇(2)转化为具有独特(E)几何形状的酯(3)。其衍生为醛(5),然后与乙基溴化镁反应,得到外消旋信息素醇(6),总产率为27.7%。它的对映选择性催化脂肪酶反式-esterification直接提供,而其对映体是通过化学乙酰化从拆分后的醇中获得的。