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Flash vacuum pyrolysis of appropriate stabilised ylides, prepared in a few steps from 2-(methylthio)nicotinic acid, give products containing previously unknown naphtho-, phenanthro-, benzothieno- and benzofuro-fused thieno[2,3-b]pyridine ring systems.
![Graphical abstract: Cascade synthesis of new tetracyclic heteroaromatic thieno[2,3-b]pyridine-containing ring systems](/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=B9NJ00528E "Graphical abstract")
