A novel ring tansfer reaction of furans to fused furans by tandem intramolecular Diels-Alder reaction and base-catalyzed ring-opening of the adducts has been developed.
variety of amines and for the elaboration of complex molecular architectures. Nevertheless, literature generally describes their synthesis in very low yield (below 5%), mainly due to the inefficiency of the last oxidation step. In this paper, we report a reliable synthesis of 4-substituted-ortho-phthalaldehyde analogues in 51% overall yield owing to the addition of a protecting step of the unstable