Abstract
Synthesis of cis-3-hydroxy- l-proline from d-glucose is reported. The methodology involves conversion of d-glucose into N-benzyloxycarbonyl-γ-alkenyl amine which on 5- endo-trig-aminomercuration gave the pyrrolidine ring skeleton with sugar appendage in 25% yield. Alternatively, N-benzyloxycarbonyl-γ-alkenyl amine on hydroboration–oxidation, mesylation and intramolecular S N2 cyclisation afforded pyrrolidine ring compound in high yield. Hydrolysis of 1,2-acetonide functionality, NaIO 4 cleavage followed by oxidation of an aldehyde into acid and hydrogenolysis afforded cis-3-hydroxy- l-proline in overall 29% yield from d-glucose.
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