4.7 Article

Unexpected Stereocontrolled Access to 1α,1′β-Disaccharides from Methyl 1,2-Ortho Esters

Journal

JOURNAL OF ORGANIC CHEMISTRY
Volume 77, Issue 1, Pages 795-800

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jo202335n

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Funding

  1. National Science Foundation [CHE 0717702]
  2. Ministerio de Ciencia e Innovation [CTQ2009-10343]
  3. Comunidad de Madrid [S2009/PPQ-1752]

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Mannopyranose-derived methyl 1,2-orthoacetates (R = Me) and 1,2-orthobenzoates (R = Ph) undergo stereoselective formation of 1 alpha,1'beta-disaccharides, upon treatment with BF3 center dot Et2O in CH2Cl2, rather than the expected acid-catalyzed reaction leading to methyl glycosides by way of a rearrangement-glycosylation process of the liberated methanol.

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