Lewis acid-catalyzed intramolecular reactions of oxocarbenium ions with propargylsilanes are described. The results obtained indicate that trimethylsilyl trifluoromethanesulfonate (TMSOTf) efficiently catalyses cyclization leading to the corresponding 3-vinylidene tetrahydropyrans in high yield as single isomers. © 2005 Elsevier Ltd. All rights reserved.
Dziedzic, M., Lipner, G., & Furman, B. (2005). An efficient approach to the synthesis of 3-vinylidene tetrahydropyrans via Prins-type cyclization. Tetrahedron Letters, 46(40), 6861–6863. https://doi.org/10.1016/j.tetlet.2005.08.014