Fm. Cordero et al., Spirocyclopropanated benzoazocinones and tetrahydropyridones from bicyclopropylidene by 1,3-dipolar cycloaddition/Rearrangement, SYNLETT, (7), 2000, pp. 1034-1036
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 is
olated yields (61-82%). The effect of para-substituents on the N-aryl ring
has been found to be marginal.