J. Barluenga et al., A NEW DOMINO SYNTHESIS OF POLYFUNCTIONALIZED PENTASUBSTITUTED PYRIDINES, Journal of the Chemical Society, Chemical Communications, (7), 1994, pp. 865-866
The reaction of N-vinylisocyanate 1 and ynamine 2 in the temperature r
ange 0-25-degrees-C affords pyridines 3 and 4 regioselectively; the in
termediate azanorbornadiene 7 has been isolated and spectroscopically
characterized.