K. Sasaki et al., POLYCYCLIC N-HETEROCYCLIC COMPOUNDS .48. SYNTHESES OF FURO[2,3-H][1,6]NAPHTHYRIDINE AND IMIDAZO(OR PYRIMIDO)[2,1-F][1,6]NAPHTHYRIDINES WITHREARRANGEMENT, Journal of heterocyclic chemistry, 33(1), 1996, pp. 49-52
The formation of a novel ring system, furo[2,3-h][1,6]naphthyridine vi
a the Smiles rearrangement and intramolecular cyclization is described
. Cyclization of 8-methyl-1,2-dihydrofuro[2,3-h][1,6]naphthyridines pr
ovided novel spiro compound with rearrangement.