Cambeiro Cambeiro, FermínLópez Estévez, SusanaVarela Carrete, Jesús ÁngelSaá Rodríguez, Carlos2020-10-052020-10-052014Cambeiro, F., López, S., Varela, J. A., Saá, C. (2014). Vinyl Dihydropyrans and Dihydrooxazines: Cyclizations of Catalytic Ruthenium Carbenes Derived from Alkynals and Alkynones. Angew. Chem. Int. Ed., 53, 23, 5959-59631433-7851http://hdl.handle.net/10347/23343NOTICE: This is the peer reviewed version of the following article: Cambeiro, F., López, S., Varela, J. A., Saá, C. (2014). Vinyl Dihydropyrans and Dihydrooxazines: Cyclizations of Catalytic Ruthenium Carbenes Derived from Alkynals and Alkynones. Angew. Chem. Int. Ed., 53, 23, 5959-5963. [doi: 10.1002/anie.201400675]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archivingA novel synthesis of 2‐vinyldihydropyrans and dihydro‐1,4‐oxazines (morpholine derivatives) from alkynals and alkynones has been developed. The cyclizations require a mild generation of catalytic ruthenium carbenes from terminal alkynes and (trimethylsilyl)diazomethane followed by trapping with carbonyl nucleophiles. Mechanistic aspects of the new cyclizations are discussed.eng© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archivingAlkynesCarbenesCyclizationHeterocyclesRutheniumjournal article10.1002/anie.2014006751521-3773open access