Stereoselective approaches to (E,E,E) and (Z,E,E)-α-chloro-ω-substituted hexatrienes: Synthesis of all E polyenes
作者:Benoit Crousse、Margarita Mladenova、Pascal Ducept、Mouâd Alami、Gérard Linstrumelle
DOI:10.1016/s0040-4020(99)00123-4
日期:1999.4
palladium-catalyzed rearrangement of bis-allylic acetates 4 and 5 and the second one is based on the stereoselective reduction of homopropargylic alcohols 6 followed by an elimination reaction. These stable chlorotrienes 1–3 are suitable synthetic intermediates for the construction of navenone B and allE polyenes (trienes, tetraenes, hexaenes and heptaenes).
从不饱和化合物4-6开始,描述了两种立体控制合成方法(E,E,E)和(Z,E,E)-α-氯-ω-取代的己三烯1-3。第一种方法的关键步骤是基于钯催化的双烯丙基乙酸酯4和5的重排,第二种方法是基于立体选择性还原均炔醇6并随后进行消除反应。这些稳定的三氯乙烯1–3是用于构建navenone B和所有E多烯(三烯,四烯,己烯和庚烯)的合适的合成中间体。