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A one-pot synthesis of 1,6,9,13-tetraoxadispiro(220.127.116.11)tetradecane by hydrodeoxygenation of xylose using a palladium catalyst
- Jackson, Michael A., Blackburn, Judith A., Price, Neil P.J., Vermillion, Karl E., Peterson, Steven C., Ferrence, Gregory M.
- Carbohydrate research 2016 v.432 pp. 9-16
- X-ray diffraction, catalysts, chromatography, data collection, esterification, hydrogen, mammals, palladium, phase transition, phosphates, temperature, xylose
- In an effort to expand the number of biobased chemicals available from sugars, xylose has been converted to 1,6,9,13-tetraoxadispiro(18.104.22.168)tetradecane in a one-pot reaction using palladium supported on silica-alumina as the catalyst. The title compound is produced in 35–40% yield under 7 MPa H2 pressure at 733 K using 3–10 wt%Pd on silica-alumina catalyst. It is isolated using a combination of liquid-liquid extractions and flash chromatography. This dimer can be converted to its monomer, 2-hydroxy-(2-hydroxymethyl)tetrahydrofuran, which ring opens under acid conditions to 1,5-dihydroxy-2-pentanone. This diol can then be esterified with vinylacetate in phosphate buffer to produce 1,5-bis(acetyloxy)-2-pentanone which is an inhibitor of mammalian 11β-hydroxysteroid dehydrogenase 1. 1H and 13C nmr spectra of each of these species are reported. The single crystal X-ray structure of the title compound is also reported. These data were collected in a temperature range of 100 K–273 K and show a solid state phase change from triclinic to monoclinic between 175 K and 220 K without a conformational change.