Bi(OTf)3-catalyzed solvent-free synthesis of pyrano[3,2-c]coumarins through a tandem addition/annulation reaction between chalcones and 4-hydroxycoumarins
作者:Mukut Gohain、Johannes H. van Tonder、Barend C.B. Bezuidenhoudt
DOI:10.1016/j.tetlet.2013.05.008
日期:2013.7
A Bi(OTf)3-catalyzedtandemaddition/annulation reaction is described in order to synthesize pyrano[3,2-c]coumarins under solvent-free conditions. Substituted/unsubstituted chalcones were conveniently condensed with various 4-hydroxycoumarins by means of this environmentally benign method which produces water as the only side product.
描述了Bi(OTf)3催化的串联加成/环合反应,以便在无溶剂条件下合成吡喃并[3,2- c ]香豆素。借助于这种环境友好的方法,取代的/未取代的查耳酮方便地与各种4-羟基香豆素缩合,该方法产生水作为唯一的副产物。