Simple and one-pot synthesis of tri and tetracyclic frameworks containing [1,8]naphthyridin-2-one moiety from the Baylis–Hillman adducts

A facile synthesis of tri and tetracyclic frameworks containing [1,8]naphthyridin-2-one skeleton from the Baylis–Hillman alcohols via the Johnson–Claisen rearrangement, followed by the treatment with Fe/AcOH in simple one-pot multi-step process is described.