Aromatic vinyl ethers and acetals underwent a novel addition-fragmentation reaction affording olefins and esters in the presence of a Lewis acid. This reaction was applied to intramolecular cyclization reaction, giving five or six membered ring compounds in good yields. Paracotoin, an intermediate in the biosynthesis of shikimic acid, was synthesized using this cyclization reaction as the key step.
芳香族
乙烯醚和
缩醛在
路易斯酸的存在下经历了一种新颖的加成-断裂反应,产生了烯烃和酯。该反应被应用于分子内环化反应,良好产率地得到五元或六元环化合物。作为木香酸
生物合成中的中间体,帕拉
可托因的合成利用了这一环化反应作为关键步骤。