M. Kotera et al., 1,3-DIPOLAR CYCLOADDITIONS OF PHOTOINDUCED CARBONYL YLIDES FROM ALPHA,BETA-UNSATURATED GAMMA,DELTA-EPOXY DINITRILES, Journal of the Chemical Society. Perkin transactions. I, (17), 1994, pp. 2353-2354
The photoinduced carbonyl ylides B and C from the alpha,beta-unsaturat
ed gamma,delta-epoxy dinitriles 2 and 3 undergo 1,3-dipolar cycloaddit
ion with enol ethers. leading regioselectively to the 8-oxabicyclo[3.2
.1]octane system.