Synthesis and conformational analysis of methyl 3-amino-2,3-dideoxyhexopyranosiduronic acids, new sugar amino acids, and their diglycotides
摘要:
The synthesis of methyl 3-azido- and 3-amino-2,3-dideoxyhexopyranosiduronic acids and their methyl esters with the -alpha,beta-D-arabino-, -alpha,beta-D-ribo, and -alpha,beta-L-lyxo configurations is presented. The conformations of the synthesized sugar amino acids and their precursors are discussed on the basis of H-1 NMR data. The influence of the 5-carboxyl group on the pyranose ring conformation is assessed, and the bonding of the monosugar amino acids into dimeric glycotides, using conventional solution-phase peptide syntheses, is reported. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis and geometry of methyl (methyl 4-O-acetyl-3-azido-2,3-dideoxy-α/β-d-arabino- and -α/β-d-ribo-hexopyranosid)uronates
摘要:
The synthesis of methyl (methyl 4-O-acetyl-3-azido-2,3-dideoxy-alpha/beta-D-arabino- and -(alpha/beta-D-ribo-hexopyranosid)uronates is presented. High resolution H-1 and C-13 NMR spectral data for all diastereoisomers and single-crystal X-ray diffraction analysis for methyl (methyl 3-azido-2,3-dideoxy-beta-D-arabino-hexopyranosid)uronate are reported. The planarity of the 4-OAc and 5-COOMe groups as well as the orientations of the aglycone and azide groups in the crystal lattice is discussed. The influence of the 5-COOMe group on the pyranose ring conformation is considered. (c) 2007 Elsevier Ltd. All rights reserved.