Experimental and Theoretical Studies on the Bismuth-Triflate-Catalysed Cycloisomerisation of 1,6,10-Trienes and Aryl Polyenes
作者:Julien Godeau、Fabien Fontaine-Vive、Sylvain Antoniotti、Elisabet Duñach
DOI:10.1002/chem.201202263
日期:2012.12.21
Cycloisomerisation of polyenes such as diethyl geranylprenylmalonate [(E)‐1 a], diethyl geranylphenylmalonate [(E)‐2 a] and diethyl cinnamylgeranylmalonate [(E,E)‐3 a] catalysed by bismuth triflate was studied from experimental and theoretical viewpoints. Several intermediates were isolated and characterised, and calculated transition‐state structures are proposed for the three reactions. The diastereoselectivity
多烯的Cycloisomerisation如二geranylprenylmalonate [(ë) - 1 ],二乙基geranylphenylmalonate [(ë) - 2 ]和二cinnamylgeranylmalonate [(ë,ë) - 3 ]通过三氟甲磺酸铋催化从实验和理论的观点研究。分离并表征了几种中间体,并针对这三种反应提出了计算的过渡态结构。在(E)-或(Z)-2 a反应期间观察到的非对映选择性有利于反式的形成讨论了稠合双环产物。还研究了由三氟甲磺酸铋衍生的活性催化物质的性质,并在实验和理论数据的支持下,提出了一种具有水分子的路易斯酸/布朗斯台德酸杂化催化剂的形成方法。