K. Matsumoto et al., 1,3-DIPOLAR CYCLOADDITION REACTIONS OF CYCLOOCTYNE WITH PYRIDINIUM DICYNOMETHYLIDES, Journal of heterocyclic chemistry, 34(1), 1997, pp. 203-208
Cyclooctyne smoothly underwent 1,3-dipolar cycloaddition with pyridini
um dicyanomethylides to afford the corresponding indolizines tricyclo[
7.6.0.0(2,7)]pentadeca-1,3,5,8-tetraenes) in excellent yields.