Deoxyfluoroketohexoses: 4-deoxy-4-fluoro-D-sorbose and -tagatose and 5-deoxy-5-fluoro-L-sorbose

G. Venkat Rao, Lawrence Que, Laurance D. Hall, Thomas P. Fondy

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


4-Deoxy-4-fluoro-α-D-sorbose (6) was prepared in crystalline form by the action of potassium hydrogen fluoride on 3,4-anhydro-1,2-O-isopropylidene-β-D-psicopyranose (3) followed by deacetonation. Under identical conditions 3,4-anhydro-1,2-O-isopropylidene-β-D-tagatopyranose (7) underwent epoxide migration to give 4,5-anhydro- 1,2-O-isopropylidene-β-D-fructopyranose (12), which after deacetonation yielded 4-deoxy-4-fluoro-D-tagatose (15) 5-deoxy-5-fluoro-α-L-sorbopyranose (16) the latter as the crystalline free sugar. The action of glycol-cleavage reagents on the isopropylidene acetals of the deoxyfluoro sugars was consistent with the assigned structures. The structures were established by 13C n.m.r. studies of the free deoxyfluoro sugars 6 and 16 of the isopropylidene acetal 13, and by 1H n.m.r. studies on the acetylated isopropylidene acetals 5 diacetate, 13 diacetate, and 14 diacetate. 5-Deoxy-5-fluoro-L-sorbose (16) was biologically active producing in mice effects characteristic of deoxyfluorotrioses and of fluoroacetate. 4-Deoxy-4-fluoro-D-tagatose (15) and 4-deoxy-4-fluoro-D-sorbose (6) produced no apparent effects in mice up to a dose of 500 mg/kg. The implications of these findings with respect to transport phosphorylation, and the action of aldolase on ketohexoses are discussed.

Original languageEnglish (US)
Pages (from-to)311-321
Number of pages11
JournalCarbohydrate Research
Issue number2
StatePublished - Apr 1975

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


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