Copper-Catalyzed Reaction of α-Aryldiazoesters with Terminal Alkynes: A Formal [3 + 2] Cycloaddition Route Leading to Indene Derivatives
作者:Eun Ju Park、Seok Hwan Kim、Sukbok Chang
DOI:10.1021/ja808080h
日期:2008.12.24
It was discovered that Cu(IPr)Cl-catalyzed reaction of terminal alkynes with alpha-aryldiazoacetates provides indene derivatives, formal [3 + 2] cycloaddition adducts. Excellent regio- and chemoselectivity were observed to afford either 3H- or 1H-indene esters depending on the reaction conditions employed. The reaction is proposed to proceed via tandem processes: alkyne insertion into copper-carbenoid
发现 Cu(IPr)Cl 催化末端炔烃与 α-芳基重氮乙酸酯的反应提供茚衍生物,即正式的 [3 + 2] 环加成加合物。根据所采用的反应条件,观察到优异的区域选择性和化学选择性以提供 3H-或 1H-茚酯。该反应建议通过串联过程进行:炔烃插入到铜卡宾中,分子内对芳环进行亲电攻击,然后异构化。