Ring expansion/opening reactions of epoxy ene-amides: access to azabicyclononene, tetrahydropyridine and tetrazole scaffolds

Epoxy benzene sulfonamides and substituted chloro-acrylaldehydes under Lewis acid mediation afford azabicyclononene or tetrahydropyridine frameworks; in the presence of additional Me 3 SiN 3 , 1,2-substituted tetrazoles are the products.