Synthesis of tricyclic oxepin-annulated pyrone derivatives has been achieved by the ring-closing enyne metathesis using the first-generation Grubbs' catalyst under a nitrogen atmosphere. The Diels-Alder reaction of these cyclized products with the dienophile proceeded smoothly to afford the tricyclic compounds in excellent yield.
在氮气氛下使用第一代 Grubbs 催化剂通过闭环烯炔复分解实现了
三环 oxepin 环化
吡喃酮衍
生物的合成。这些环化产物与亲二烯体的狄尔斯-阿尔德反应顺利进行,以优异的收率得到
三环化合物。