Spirocyclopropanated benzoazocinones and tetrahydropyridones from bicyclopropylidene by 1,3-dipolar cycloaddition/Rearrangement

摘要

1,3-Dipolar cycloaddition of N-aryl-C-phenylnitrones to bicyclopropylidene and subsequent thermal rearrangement afforded mixtures of spirocyclopropane-annelated tetrahydropyridones 12 and benzoazocinones 13 in good overall isolated yields (61-82%). The effect of para-substituents on the N-aryl ring has been found to be marginal. [References: 11]