One-pot multistep synthesis of bipolar carbazolo-phenazines: Hydrogen bond control of Diels-Alder cycloaddition and application for fluoride sensing
作者:Abhaya Kumar Mishra、Arindam Mukhopadhyay、Jarugu Narasimha Moorthy
DOI:10.1016/j.tet.2017.02.052
日期:2017.4
cascade, which involves oxidation of 2-naphthols to 1,2-naphthoquinones, Diels-Alder cycloaddition, aerial dehydroaromatization and cyclocondensation. With unprotected dienic indolylacrylates, NH⋯O hydrogen bonding in the transition state controls the product selectivity almost exclusively in favor of Diels-Alder cycloaddition over the competing Michael addition. The utility of one of the carbazolo-phenzines
一锅IBX引发的多步级联反应证明了新型双极咔唑-吩嗪的获得,该反应涉及将2-萘酚氧化为1,2-萘醌,Diels-Alder环加成反应,空中脱氢芳构化和环缩合反应。对于未保护的二烯丙基吲哚基丙烯酸酯,在过渡态下的NH 3 H氢键几乎完全控制了狄尔斯-阿尔德环加成反应,而不是竞争性迈克尔加成反应,从而控制了产物选择性。证明了一种咔唑吩嗪用于氟化物的选择性肉眼检测。