1,3-Dipolar Cycloaddition Reactions of 4-Halophenylphthalazinium Ylides to Activated Alkenes and Alkynes

For the first time in the benzodiazinium ylide series cycloaddition of (4-halophenyl) substituted ylides to activated alkenes and alkynes was studied. The ability of these ylides to react with acrylonitrile, N -phenylmaleimide, ethyl propiolate and dimethyl acetylenedicarboxylate was investigated. The stereochemistry and regiochemistry involved in these reactions are also discussed. Two new salts and ten new azabicyclic compounds have been obtained.