GAP chemistry for pyrrolyl coumarin derivatives: a highly efficient one-pot synthesis under catalyst-free conditions

Abstract

A concise and efficient one-pot synthesis of pyrrolyl coumarin derivatives via a four-component reaction of 4-hydroxycoumarin, arylglyoxal monohydrate, dialkyl but-2-ynedioate and amines under catalyst-free conditions in an environmentally friendly medium (ethanol) is described. This synthesis was confirmed to follow the group-assisted-purification (GAP) chemistry process, which can avoid traditional chromatography and recrystallization purification methods.