Formation of 2-oxa- or 2-azabicyclo[3.3.0]octa-3,7-diene by a novel tandem intramolecular photo-cyclization of 2,4,6-tris(phenylthio)hepta-2,4,6-trienal derivatives
Abstract
The photo-reactions of 2,4,6-tris(phenylthio)hepta-2,4,6-trienal 1 and its 2,4-dinitrophenylhydrazone 5 gave the 2-oxa- or 2-azabicyclo[3.3.0]octa-3,7-dienes 2 and 9, respectively, via a photo-induced intramolecular tandem cyclization reaction.