A green approach for highly regioselective syntheses of furo[3,2-h]quinolines in aqueous medium

An environmentally benign, high yielding, and operationally simple protocol has been developed for the regioselective synthesis of furo[3,2-h]quinolines in aqueous micellar medium involving Cu-free domino Sonogashira reaction followed by 5-endo-dig-cyclization of substituted 8-hydroxyquinolines and terminal alkyne by using Pd(C6H5CN)Cl2 as catalyst and 2-pyridinecarboxaldehyde methylphenyl hydrazone as ligand under aerobic condition.