Abstract
N-Substituted 8-hydroxybenzo[g]chromeno[4,3-b]indol-6(13H)-ones have been efficiently synthesized via a Nenitzescu reaction of naphthoquinone (or benzoquinone) and N-substituted 4-aminocoumarins in the presence of a catalytic amount of KHSO4 with a [bmim][BF4]/toluene system. Keywords: Coumarins, Nenitzescu reaction, quinones, ionic liquid.
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