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Lewis Acid Mediated Intramolecular C–C Bond Formation of Alkyne-Epoxide Leading to Six-Membered Nitrogen and Oxygen Heterocycles

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journal contribution
posted on 02.05.2014, 00:00 by Priya Ghosh, Pipas Saha, Somasekhar Bondalapati, Kiran Indukuri, Anil K. Saikia
Intramolecular C–C bond formation of oxygen- and nitrogen-tethered alkynes and epoxide mediated by Lewis acid under ambient conditions is described. A simple procedure for the synthesis of 3,6- and 5,6-dihydropyrans and 3,4-dehydropiperidines from acyclic building blocks in good yields without using any transition metal is shown.