Synthesis of a constrained polyfunctional bicyclic iminocyclitol scaffold from l-sorbose via a tandem sequence including stereoselective intramolecular Huisgen cycloaddition
2009
The synthesis of a functionalized (azido, amino, and hydroxy) 8-oxa-3-azabicyclo[3.2.1]octane framework and its conversion into a protected sugar amino acid and a tricyclic framework is described. The sequence includes a one-pot Huisgen 1,3-dipolar cycloaddition, with decomposition to an aziridine and subsequent ring opening by azide. The stereoselectivity observed in the Huisgen cycloaddition reaction is attributed to minimization of allylic strain.
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