Tandem Processes in<i>C</i>-Aryl Ketenes and Ketenimines Triggered by [1,5]-Hydride-Like Migration of an Acetalic Hydrogen Atom
作者:Angel Vidal、Marta Marin-Luna、Mateo Alajarin
DOI:10.1002/ejoc.201301501
日期:2014.2
3-dioxolan-2-yl)phenyl ketenes that, under thermal conditions, smoothly underwent a [1,5]-H shift/6π-electrocyclic ring-closure sequence to give 1H-2-benzopyrans. The application of such processes to ketenes, produced by replacing the phenyl scaffolding with a thiophene ring, afforded thienopyrans. The aza-Wittig reaction of these 2-(1,3-dioxolan-2-yl)phenyl and thienyl ketenes with N-aryliminophosphoranes
加热一系列适当取代的重氮乙酰乙酸酯产生了 2-(1,3-dioxolan-2-yl) 苯基烯酮家族,在热条件下,它们顺利地经历了 [1,5]-H 位移/6π-电环闭环序列得到 1H-2-苯并吡喃。将这些方法应用于通过用噻吩环代替苯基支架而产生的乙烯酮,得到噻吩并吡喃。这些 2-(1,3-dioxolan-2-yl) 苯基和噻吩基烯酮与 N-芳基亚氨基膦的 aza-Wittig 反应提供了类似的烯酮亚胺,它们在类似的热条件下转化为相应的 1(2H) 异喹啉酮和噻吩并吡啶酮,遵循相同类型的级联序列。