Carbohydr Res. 2021 Dec 21;511:108494. doi: 10.1016/j.carres.2021.108494. Epub 2021 Dec 21.
Unusual C-C bond cleavage of an α-trifloxy Sialic acid hemiacetal under Lattrell-Dax conditions.
Carbohydrate research
Santanu Jana, David Crich
Affiliations
Affiliations
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA, 30602, USA; Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA, 30602, USA.
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA, 30602, USA; Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA, 30602, USA; Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, GA, 30602, USA. Electronic address: [email protected].
PMID: 34959032
DOI: 10.1016/j.carres.2021.108494
Abstract
We describe the novel oxidative fragmentation of methyl (5-acetamido-4,7,8,9-tetra-O-acetyl-5-deoxy-3-O-trifluoromethanesulfonyl-β-D-erythro-L-gluco-2-nonulopyranos)onate 2 on stirring with sodium nitrite in DMF to give the novel 3-acetamido-2,5,6,7-tetra-O-acetyl-d-glycero-d-galacto-heptono-1,4-lactone 3 in excellent yield. Stirring of the same triflate with sodium carbonate on the other hand affords the novel methyl (5-acetamido-7,8,9-tri-O-acetyl-3,6-anhydro-5-deoxy-d-manno-3-ene-2-nonulos)onate 19 also in excellent yield. Reduction of the heptono lactone with sodium borohydride followed by acetylation gives a peracetylated aminodeoxyheptitol 6 that adopts the zig zag conformation of its carbon backbone.
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Keywords: Conformational analysis; Furanolactone; Lattrell-Dax reaction; Oxidative cleavage; Sialic acid
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