Moderately electron-rich alkynes, such as alkynyl carboxylates 2a, b, siloxyalkynes 2c, d, an alkynyl p-toluenesulphonate 2e, and ethoxyacetylene 2f, add exclusively to the C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
N bond of the kinetically stabilized azete 1; with terminal alkynes 2a, f, a mixture of the regioisomeric 1-Dewar-pyridines 3 and 4 is obtained, whereas addition of internal alkynes results only in 3-oxy-1-Dewar-pyridines 3.
G. Mass, M. Regitz, R. Rahm, J. Schneider, P. J. Stang and C. M. Crittell, J. Chem. Soc., Chem. Commun., 1990, 1456 DOI: 10.1039/C39900001456
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