The insertion of cyclopropylidenes and related species into an
intramolecular CeH bond is an attractive strategy for the construction
of cyclopropane-containing bicyclic compounds because
the new CeC bond can be directly formed between the unfunctionalized
carbon atom and the cyclopropylidene carbon atom.5,6
Baird and co-workers have reported the synthesis of methanoproline
and its analogs by the insertion of (dialkylamino)
methyl-substituted cyclopropyllithium carbenoids into a CeH