Abstract
Homochiral 7-oxa-2-azabicyclo[2.2.1]heptane and 8-oxa-6-azabicyclo[3.2.1]octane ring systems can be synthesized by reaction of specifically protected phosphoramidate derivatives of carbohydrates with (diacetoxyiodo)benzene or iodosylbenzene and iodine. The reaction mechanism goes through homolytic fragmentation of a hypothetical iodoamide intermediate. The N-radicals so generated participate in an intramolecular hydrogen abstraction reaction (IHA) to give the aforementioned bicycles.
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