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Amino-Acid-Derived Amides as Stereodirecting Leaving Groups for Ferrier Rearrangement via Pd(0)-Catalyzed Tsuji-Trost
1Department of Chemistry, National Institute of Technology Patna, Patna 800 005, India.
Abstract:
Ferrier rearrangement on glycals is an efficient tool to form 2,3-dideoxy glycosides that provide access to various sugar derivatives through olefin functionalization. The classical acid-mediated transformation delivers the α-O-glycosides selectively. In this protocol, amides obtained from amino acids, glycine and proline, have been utilized as sustainable β-directing leaving groups on glycal substrates. The directing groups facilitate β-selective Ferrier rearrangements for hard alcohol nucleophiles by following the Pd(0)-catalyzed Tsuji-Trost inner sphere pathway.
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