Trapping of diacceptor-substituted methylenecyclopropanes with isocyanides - A further application of the principle of the twofold nucleophilic substitution at a cyclopropane

Article abstract of DOI:10.1055/s-1990-27073

Unstable 2-cyclopropylidene-1,3-diones 3 can be trapped by isocyanides 8 to give [4 +1]-cycloadducts 9 and 12. In the case of Meldrum's acid, as the dioxo component, spirotricyclic imides 15 are isolated due to an easy degradation of the primary cycloaddi