Natural (5′-oxoheptene-1′E,3′E-dienyl)-5,6-dihydro-2H-pyran-2-one: total synthesis and revision of its absolute configuration
作者:Samir Bouzbouz、Elsa de Lemos、Janine Cossy、Jairo Saez、Xavier Franck、Bruno Figadère
DOI:10.1016/j.tetlet.2004.01.143
日期:2004.3
The synthesis of (5′-oxoheptene-1′E,3′E-dienyl)-5,6-dihydro-2H-pyran-2-one has been performed in seven steps using four key steps: a ring-closing metathesis reaction to build up the unsaturated lactone, a Wittig reaction to control the C6–C7 (E) double bond, a cross-metathesis reaction to control the (E) double bond at C8–C9, and an enantioselective allyltitanation to control the absolute configuration
(5所述的合成' -oxoheptene-1 ' è,3 ' È -dienyl)-5,6-二氢-2- ħ -吡喃-2-酮已使用四个关键步骤七个步骤被执行:一个闭环复分解反应建立起来的不饱和内酯,Wittig反应,以控制C6-C7(é)双键,交叉复分解反应,以控制(Ë在C8-C9)双键,和对映体选择性allyltitanation控制的绝对构型在C5。光谱数据(IR,MS,1 H和131 C NMR)与天然化合物的相同,只是旋光性不同,这使我们重新指定了天然产物的绝对构型。