131802-10-3Relevant articles and documents
Cycloadditions of Alkynyl Esters and Ethers with 1,2,3-Tri-t-butyl Azete
Maas, Gerhard,Regitz, Manfred,Rahm, Rainer,Schneider, Juergen,Stang, Peter J.,Crittell, Charles M.
, p. 1456 - 1457 (2007/10/02)
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=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.