Polycyclic N-heterocyclic compounds. Part 63: Improved synthesis of 5-amino-1,2-dihydrofuro[2,3-c]isoquinolines via truce-smiles rearrangement and subsequent formation to furo[2,3-c]isoquinoline.

An improved synthesis of 5-amino-1,2-dihydrofuro[2,3-c]isoquinoline has been achieved using a slight modification of reaction conditions for the Truce-Smiles rearrangement. Acid treatment of the obtained 5-amino-1,2-dihydrofuro[2,3-c]isoquinolines gave unexpected ring-opened spiro ring compounds. The previously unreported parent compound, furo[2,3-c]isoquinoline, was also synthesized.