Zur Reaktion von Triafulvenen mit Isonitrilen. Eine einfache Synthese von diphenylsubstituierten funktionalisierten Cyclobuten-Derivaten und deren Folgeprodukten
作者:Theophil Eicher、Uwe Stapperfenne
DOI:10.1055/s-1987-28024
日期:——
Reaction of Triafulvenes with Isonitriles. A Simple Synthesis of Diphenyl-Substituted Functionalized Cyclobutene Derivatives and Related Products The reactions of triafulvenes 1a-e with a series of isonitriles 2a-e are investigated. From 1a-c in aprotonic media 2-methylenecyclobutene-1-one imines (3a-h) are formed in good yields, which are characterized by spectral data, hydrolysis to 2-methylenecyclobutene-1-ones 4 and independent synthesis of a selected hydrolysis product (4c). In protonic media the products 3, e.g. 3b,e, incorporate a solvent molecule to give N-alkyl pyrrols 7,8. Triafulvenes 1d and 1e give other types of products, whose structures are likely to be 12-15. A mechanism for the reaction of triafulvenes with isonitriles is presented, in which an allenic ketene intermediate plays a central role for the formation of all products obtained.
三芳基乙烯与异腈的反应。二苯基取代的官能化环丁烯衍生物及相关产品的简单合成。研究了三芳基乙烯1a-e与一系列异腈2a-e的反应。在非质子介质中,1a-c生成2-亚甲基环丁烯-1-酮亚胺(3a-h)的收率很高,通过光谱数据对其进行了表征,水解生成2-亚甲基环丁烯-1-酮4,并独立合成选定的水解产物(4c)。在质子介质中,产物3(例如3b、e)与溶剂分子结合生成N-烷基吡咯7、8。三芳基乙烯1d和1e生成其他类型的产品,其结构可能是12-15。提出了三芳基乙烯与异腈反应的机理,其中烯丙基烯酮中间体在形成所有产物中起着核心作用。