Lewis acid-catalysed nucleophilic opening of a bicyclic hemiaminal followed by ring contraction: Access to functionalized L-idonojirimycin derivatives
Résumé
The Lewis acid-catalyzed nucleophilic opening of a D-gluco-configured bicyclic hemiaminal has been examined.
Several Lewis acids and silylated nucleophiles have been screened allowing the introduction of acetophenone,
phosphonate or nitrile at the pseudoanomeric position in satisfactory yields and high 1,2 trans stereoselectivities.
Their skeletal rearrangement triggered by the N-benzyl anchimeric assistance provided the corresponding L-idoconfigured
piperidines displaying various functional groups at C-6 position in good yield.
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