Gallium(III) chloride-catalyzed three-component coupling of naphthol, alkyne and aldehyde: a novel synthesis of 1,3-disubstituted-3H-benzo[f] chromenes
Three-component coupling of naphthol, alkyne and aldehyde has been achieved in the presence of 10 mol % gallium(III) chloride in toluene under reflux conditions to afford the corresponding 1,3-disubstituted-3H-benzo[f]chromenes in good yields. This is the first example on the preparation of chromenes from naphthol, alkyne and aldehyde.
在甲苯中存在10 mol%氯化镓(III)的条件下,在回流条件下,萘酚,炔烃和醛的三组分偶联反应得以实现,从而得到相应的1,3-二取代-3 H-苯并[ f ]色烯。产量。这是从萘酚,炔烃和醛制备二苯甲基苯的第一个实例。
Iron-Catalyzed Regioselective Hydroaryloxylation of CC Triple Bonds: An Efficient Synthesis of 2<i>H</i>-1-Benzopyran Derivatives
作者:Xiaobing Xu、Jun Liu、Linfeng Liang、Hongfeng Li、Yanzhong Li
DOI:10.1002/adsc.200900483
日期:2009.11
An efficient, regioselective, iron-catalyzed intramolecular hydroaryloxylation of 2-propargylphenols or naphthols is reported. The reactions proceed through an endo-dig cyclization to afford benzopyran or naphthopyran derivatives in good to high yields using iron(III) chloride as the catalyst with the assistance of aniline in dimethylformamide (DMF).