Synthesis of Pyrroloquinoline and Pyrrolonaphthyridine by an Intramolecular Cyclisation Reaction

4-Methylthiopyrrolo[1,2-a][1,8]naphthyridine and pyrrolo[1,2-a]-quinoline were prepared by an intramolecular cyclisation in acidic media of 1-methylsulfinyl-1-methylthio-2-[3-(2-(1-pyrrolyl)pyridin or phenyl)]ethylene