Hydrochloric Acid → 3,4,5-Piperidinetriol, 1-ethyl-2-(hydroxymethyl)-, (2R,3R,4R,5S)-

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Reaction Steps

1.0 gram of N-ethylglucamine is suspended in 50 mL water and titrated to pH 5.0 with concentrated HCl (simultaneously dissolving the aminosugar). This solution is placed in a 500 mL shaker flask. To this solution is added 2.0 grams (wet weight) of washed Gluconobacter oxydans cells and the solution agitated at 100-120 rpm. After 24 hours, HPLC analysis indicates that 70% of the initial charge of N-ethylglucamine has been converted to 6-ethylamino-6-deoxy-α-L-sorbofuranose, and after 48 hours, at least 90% has been converted. After 72 hours, the supernatant is separated from the cells and sterile filtered. An aliquot (10 mL) of the supernatant is adjusted to pH 9.0 with concentrated NH4OH, chilled in an ice bath, and 100 mg NaBH4 is added. After standing in the ice bath overnight, the samples are acetylated and assayed by gas chromatography (GC)-mass spectroscopy. GC-mass spectroscopy indicates a 60% yield of N-ethyl-1-deoxynojirimycin from 6-ethylamino-6-deoxy-α-L-sorbofuranose (Chemical ionization mass spectroscopy of the acetylated product indicates that the GC peak corresponding to the reduced cyclized product has a parent peak mass of 360 (M+H), corresponding to tetraacetylated N-ethyl-1-deoxynojirimycin).

Provenance & Evidence