An Efficient Convergent Synthesis of GP1c Ganglioside Epitope

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Abstract
In this report, we describe an efficient convergent synthesis of the GP1c glycolipid epitope, which is one of the most complex c-series gangliosides. The α(2,3) and α(2,8) sialylations were accomplished by use of 5N,4O-carbonyl and 7,8-O-isopropyliden as well as 5N,4O-carbonyl- and 7,8-di-O-chloroacetyl-protected sialyl donors in good yields with excellent α-selectivity, respectively. The two sialyl donors enable synthesis of the di- and trisialylgalactosides by simple glycosylation and deprotection. We synthesized the protected GP1c glycolipid epitope, which is a compact, rigid, branched structure, via direct coupling of tetarasaccharide and pentasaccharide units.