Asakura N, Motoyama A, Uchino T, Tanigawa K, Yamada H. Synthesis of 3,6-O-(o-xylylene)glucopyranosyl fluoride, an axial-rich glycosyl donor of β-glycosylation.
J Org Chem 2013;
78:9482-7. [PMID:
23984627 DOI:
10.1021/jo401395h]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Despite the reported complete β-selectivity in glycosylation with 2,4-di-O-benzyl-3,6-O-(o-xylylene)glucopyranosyl fluoride, its preparation has been inefficient. This paper describes an improved route for the donor, including the formation of the 3,6-bridge on 1,2,4-orthoacetylglucose, the preparation of which was also refined, along with a discovered feature that the 3,6-bridged glucose prefers the furanose form. Although this feature made the synthesis of the desired glucopyranosyl donor difficult, application of thermal glycosylation solved the problem. With a modifiable intermediate, the improved availability of the donor would expand the applications.
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