A metal-free and atom-economic route for the synthesis of naphtho[1,2-b]furan-3-ones has been realized via p-TsOH·H2O-catalyzed intramolecular tandem double cyclization of γ-hydroxy acetylenic ketones with alkynes in formic acid. The benzene-linked furanonyl-ynes are the key intermediates obtained by the scission/recombination of C–O double bonds. Further, the structural modifications of the representative
通过p -TsOH·H 2 O 催化 γ-羟基炔酮的分子内串联双环化,实现了无
金属且原子经济的
萘并[1,2- b ]
呋喃-3-酮合成路线
甲酸中的
炔烃。苯连接的
呋喃酰炔是通过 C-O 双键断裂/
重组获得的关键中间体。此外,还通过还原、去甲基化、取代和[5+2]-环加成等方式对代表性产物进行了结构修饰。