阿托醛缩醛的酸催化串联反应被建立用于合成三个重要分子,2,2-二取代 indolin-3-ones、萘并呋喃和芪。该合成是使用新的反应级联反应实现的,其中涉及相同的两个初始步骤:(i) S N 2' 取代,其中阿托醛充当亲电子试剂;(ii) 生成的苯乙醛类产物的碳-碳键的氧化裂解。与文献方法相比,本协议不仅避免使用昂贵的贵金属催化剂,而且操作简单。
A metal-free oxidative arene/alkene annulation-aromatization has been realized, which enables efficient synthesis of 2-arylnaphtho[2,1-b]furans from readily available terminalarylalkenes and 2-naphthols. Mechanistic study suggests that this reaction proceeds via free-radical initiated tandem cyclization, dehydrogenative rearomatization and aromatization.
已经实现了无金属的氧化芳烃/烯烃环化-芳香化,其使得能够从容易获得的末端芳基烯烃和2-萘酚有效地合成2-芳基萘[2,1- b ]呋喃。机理研究表明,该反应是通过自由基引发的串联环化,脱氢重新芳构化和芳构化进行的。
Metal-Free Oxidative Annulation of 2-Naphthols with Terminal Alkynes Affording 2-Arylnaphtho[2,1<i>-b</i>]furans
For the first time, the selective oxidative transformation of 2-naphthols with terminal alkynes is disclosed, which enables the straightforward synthesis of 2-arylnaphtho[2,1-b]furans in satisfactory yields under metal-free conditions. Mechanistic study suggests that the reaction proceeds via free-radical-mediated sp2-C–H bond activation, C–C coupling, and C–O cyclization.
首次公开了2-萘酚与末端炔烃的选择性氧化转化,其使得在无金属条件下以令人满意的产率直接合成2-芳基萘[2,1- b ]呋喃成为可能。机理研究表明,该反应通过自由基介导的sp 2 -C–H键激活,CC偶联和CO环化来进行。