Synthesis of higher carbon sugars. Unexpected rearrangement of higher sugar allylic alcohols
摘要:
Coupling of a sugar phosphonate with a sugar aldehyde afforded a C-13-higher sugar enone. Reduction of the carbonyl function provided both stereoisomeric allylic alcohols. Inversion of the configuration at the carbinol centre in these derivatives did not yield the expected S(N)2 product, but proceeded with rearrangement to the tetrahydrofuran derivative. (C) 2008 Published by Elsevier Ltd.
Coupling of a sugar phosphonate with a sugar aldehyde afforded a C-13-higher sugar enone. Reduction of the carbonyl function provided both stereoisomeric allylic alcohols. Inversion of the configuration at the carbinol centre in these derivatives did not yield the expected S(N)2 product, but proceeded with rearrangement to the tetrahydrofuran derivative. (C) 2008 Published by Elsevier Ltd.