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DOI: 10.1055/s-0029-1218719
Synthesis of a Mannose Hexasaccharide Related to the Cell Wall Mannan of Candida dubliniensis and Trychophyton mentagrophytes
Publication History
Publication Date:
26 March 2010 (online)
Abstract
2,6-Branched mannose hexasaccharide 1 related to the cell wall polysaccharide of Candida dubliniensis and Trychophyton mentagrophytes was concisely synthesized from 4-methoxyphenyl α-d-mannopyranoside (6) in 11 steps in 26% total yield. The efficiency of the synthesis relies on the preparation of a trisaccharide acceptor 2 with three free hydroxy groups, which could be glycosylated with trichloroacetimidate 19 to provide the protected hexasaccharide 20 in one step. Compound 2 was obtained via sequential assembly from the building blocks, 2,6-di-O-allyloxycarbonyl-3,4-di-O-benzoyl-α-d-mannopyranose trichloroacetimidate (3), 4-methoxyphenyl 3,4-di-O-benzoyl-α-d-mannopyranoside (4), and 4-methoxyphenyl 4-O-acetyl-3-O-benzoyl-α-d-mannopyranoside (5). Structures of target compound and intermediates were characterized by ¹H and ¹³C NMR, MS, HRMS, and elemental analysis.
Key words
synthesis - oligosaccharide - mannose - Candida dubliniensis - Trychophyton mentagrophytes
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