Abstract
A novel method for the assembly of medium heterocycles via an intramolecular nucleophilic addition to cyclopropenes generated in situ from the corresponding bromocyclopropanes is described. The exo-trig nucleophilic cyclizations were shown to proceed very efficiently and in a highly diastereoselective fashion affording cis-fused bicyclic products possessing 7 to 10-membered medium rings; starting from a diastereomeric mixtures of bromocyclopropanes.
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