- Improved and large-scale synthesis of different protected d-glucuronals
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Although different protected d-glucuronals are used as precursors for the preparation of many compounds, standard procedures and large-scale syntheses are still not described in the literature. In the course of the development of different protected d-glucuronyl donors we developed several versatile methods that can be used for fast and reproducible preparation of large amounts of the key intermediates. d-Glucuronolactone was converted to methyl 3,4-di-O-acetyl-d-glucuronal applying a novel one-pot protocol, which allowed for large-scale synthesis. Introduction of silyl and benzyl groups was achieved using optimized procedures. Furthermore 3,4,6-tri-O-acetyl-d-glucal was used as starting material for an improved preparation of benzyl protected d-glucuronal, which significantly accelerates and simplifies similar methods described in the literature.
- Mikula, Hannes,Matscheko, Dominik,Schwarz, Markus,Hametner, Christian,Fr?hlich, Johannes
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- A METHOD OF PREPARATION OF QUATERNARY NITROGEN COMPOUNDS
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The invention relates to a method of preparation of a quaternary amine having formula 2, by reacting an epoxide having formula 3, Formula 3 with an aliphatic tertiairy amine group in the presence of a suitable Lewis acid.
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Page/Page column 5
(2009/01/20)
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- X-ray diffraction and high-resolution NMR spectroscopy of methyl 3,4-di-O-acetyl-1,5-anhydro-2-deoxy-d-arabino-hex-1-enopyranuronate
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Single-crystal X-ray diffraction and high-resolution 1H and 13C NMR spectral data for methyl 3,4-di-O-acetyl-1,5-anhydro-2-deoxy-d-arabino-hex-1-enopyranuronate are reported. The 5H4 conformation was found to be the preferred form for this glycal, both in the crystal lattice and in solution. The factors determining the 4H5 ? 5H4 conformational equilibrium for acetylated glycals are discussed.
- Liberek, Beata,Tuwalska, Dorota,Konitz, Antoni,Sikorski, Artur
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p. 1280 - 1284
(2008/02/02)
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- Conversion of glucuronic acid glycosides to novel bicyclic β-lactams
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(matrix presented) Methodology for the conversion of glucuronic acid glycosides to novel bicyclic β-lactams is reported. Using this strategy, we prepared two novel templates suitable for use in combinatorial chemistry strategies for the construction of a
- Durham, Timothy B.,Miller, Marvin J.
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p. 135 - 138
(2007/10/03)
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- Synthesis of 1α-Hydroperoxy Sugar Derivatives
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The title compounds 4 and 5 can be prepared from acetylated glycals with H2O2 under acid catalysis.
- Fehlhaber, Hans-Wolfram,Snatzke, Guenther,Vlahov, Iontscho
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p. 637 - 638
(2007/10/02)
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