TMSOTf-mediated reaction of alkynyl vinylogous carbonates serendipitously gave 1,4-oxazepine and dihydropyran dienes transposition of an ethyl acrylate moiety involving intramolecular cascade Prins-type cyclization/retro-oxa-Michael reaction/cycloisomerisation. The developed atom-economical protocol selectively provides an double bond geometry. Dihydropyran dienes could be reduced diastereoselectively using EtSiH/TMSOTf or could be transformed into polycyclic heterocycles by Heck reaction.
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