Hydrophilically functionalized pyrazoles from sugars

  • Oikawa N
  • Müller C
  • Kunz M
 et al. 
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Abstract

An effective and convenient protocol has been developed for the conversion of D-glucose and 6-O-α-D-glucopyranosyl-D-fructose (palatinose®, isomaltulose) into 5-[(1'S)-1','2/-dihydroxyethyl]-1-phenylpyrazole-3-carboxaldehyde (4) and 5-[(1'S)-2-(α-D-glucopyranosyloxy)-1-hydroxethyl])-1-phenylpyrazole-3 -carboxaldehyde (5), key steps being the acetic anhydride-promoted dehydrative cyclization of the respective phenylosazones, and subsequent liberation of the N-acetylphenylhydrazone-blocked aldehyde function. Exploitation of the ensuing chemistry of 4 and 5 led to a variety of pyrazole building blocks with a diverse level of hydrophilic substituents (hydroxymethyl, dihydroxyethyl or glucosyl residues) and useful functional groups, such as chloro, cyano, aminomethyl, vinyl and acryloyl moieties.

Author-supplied keywords

  • Hydrophilic pyrazoles
  • Isomaltulose
  • Osazone→pyrazole conversions
  • Palatinose

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Authors

  • Nobuhiro Oikawa

  • Christoph Müller

  • Markwart Kunz

  • Frieder W. Lichtenthaler

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