for the diversifiedsynthesis of furans and arenofurans has been developed that proceeds through K2CO3‐promoted cyclization between enols/1,3‐dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole‐transporting materials. This procedure also provides directaccess to dioxa[5]helicenes
已经开发了一种多样化合成呋喃和槟榔呋喃的通用方法,该方法通过在EtOH中回流,通过K 2 CO 3促进烯醇/ 1,3-二羰基化合物与硝基烯烃之间的环化反应来进行。这种简便的方法已成功用于苯并三呋喃衍生物的合成,苯并三呋喃衍生物是有用的空穴传输材料。该程序还提供了直接接触二氧杂[5]螺旋的方法。该反应提供了广泛的底物范围,使用了廉价的碱和对环境无害的溶剂,并且操作简单。
Regioselective Transition Metal-Free Catalytic Ring Opening of 2<i>H</i>-Azirines by Phenols and Naphthols; One-Pot Access to Benzo- and Naphthofurans
作者:Arnab Roy、Subrata Biswas、Surajit Duari、Srabani Maity、Abhishek Kumar Mishra、Aguinaldo R. de Souza、Asma M. Elsharif、Nelson H. Morgon、Srijit Biswas
DOI:10.1021/acs.joc.3c01266
日期:2023.11.17
naphthofuran derivatives are synthesized from readily available phenols and naphthols. Regioselective ringopenings of 2H-azirine followed by in situ aromatization using a catalytic amount of Brønsted acid have established the novelty of the methodology. The involvement of a series of 2H-azirines with a variety of phenols, 1-naphthols, and 2-naphthols showed the generality of the protocol. In-depth