Rapid Access to 1,6-Anhydro-β-l-hexopyranose Derivatives via Domino Reaction: Synthesis of l-Allose and l-Glucose
摘要:
An expeditious and efficient synthesis of 1,6-anhydro-beta-L-hexopyranosyl derivatives 3 as valuable building blocks for the preparation Of L-sugars is herein reported. This route relies upon the use of a domino reaction involving five synthetic steps from the 5,6-dihydro-1,4-dithiin 4. As 1,6-anhydro derivatives 3 are obtained, dithioethylene bridge removal and double-bond dihydroxylation give access to protected L-allose and L-glucose in stereoselective fashion and high yields.
De novo approach to l-anhydrohexitol nucleosides as building blocks for the synthesis of l-hexitol nucleic acids (l-HNA)
作者:Daniele D’Alonzo、Annalisa Guaragna、Arthur Van Aerschot、Piet Herdewijn、Giovanni Palumbo
DOI:10.1016/j.tetlet.2008.07.159
日期:2008.10
5-anhydrohexitol nucleoside analogues belonging to l-series as building blocks for l-HNA oligonucleotide synthesis has been efficiently tuned. Key to the successful outcome of our approach is the development of a DDQ-mediated domino reaction, which leads to the formation of an unsaturated 1,6-anhydrosugar derivative. Sugar elaborations and base insertion then enable to synthesize six-membered nucleosides.