Ring transformations of heterocyclic compounds.XXIV. 1′,2′,5′,6′-Tetrahydro-4′H-spiro[cyclohexa-2,4-diene-1,2′-pyrrolo[3,2,1-ij]quinoline] and 1,2,4,5,6,7-hexahydrospiro[azepino[3,2,1-hi]indole-2,1′-cyclohexa[2,4]diene] - Two new spiro[cyclohexadiene-azaheterocycles] easily accessible by pyrylium ring transformation