Microwave-assisted synthesis of α-aminophosphonate-chromone hybrids using Kabachnik-Fields Reaction

An efficient, practical, and green approach for the synthesis of α -aminophosphonates incorporating a chromone moiety by the one-pot Kabachnik-Fields reaction has been developed. The three-component reactions of 3-formylchromones, primary amines and dialkyl phosphites was carried out in short reaction times in the absence of any catalyst or solvent under microwave irradiation. The method developed did not require column chromatographic separation since the products could be recovered from the reaction mixture by simple filtration. The method developed could be applied to a range of primary amines and dialkyl phosphites, which confirmed the large scope and functional-group tolerance.