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。