Köllmann C, Jones PG, Werz DB. Synthesis of 5-C-Methylated d-Mannose, d-Galactose, l-Gulose, and l-Altrose and Their Structural Elucidation by NMR Spectroscopy.
Org Lett 2018;
20:1220-1223. [PMID:
29406726 DOI:
10.1021/acs.orglett.8b00144]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
C5/C6-Spirocyclopropanation of exocyclic enol esters followed by alkali ring-opening of the three-membered ring was used for the diastereoselective preparation of 5-C-methylated d-mannose, d-galactose, l-gulose, and l-altrose. Extensive NMR studies demonstrated an increase of furanose form by 5-C-methylation in almost all cases.
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