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Molecules 2013, 18(12), 15153-15181; doi:10.3390/molecules181215153

Extending the Glucosyl Ceramide Cassette Approach: Application in the Total Synthesis of Ganglioside GalNAc-GM1b

1
Department of Applied Bio-Organic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
2
Institute for Integrated Cell-Material Sciences, Kyoto University, 69 Konoe-cho, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
*
Authors to whom correspondence should be addressed.
Received: 7 November 2013 / Revised: 1 December 2013 / Accepted: 2 December 2013 / Published: 10 December 2013
(This article belongs to the Special Issue Synthesis, Structure, Analysis and Properties of Glycolipids)
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Abstract

The development of a novel cyclic glucosyl ceramide cassette acceptor for efficient glycolipid syntheses was investigated. p-Methoxybenzyl (PMB) groups were selected as protecting groups at C2 and C3 of the glucose residue with the aim of improving the functionality of the cassette acceptor. The choice of the PMB group resulted in a loss of β-selectivity, which was corrected by using an appropriate tether to control the spatial arrangement and the nitrile solvent effect. To investigate the effect of linker structure on the β-selectivity of intramolecular glycosylation, several linkers for tethering the glucose and ceramide moiety were designed and prepared, namely, succinyl, glutaryl, dimethylmalonyl, and phthaloyl esters. The succinyl ester linker was the best for accessing the cassette form. The newly designed glucosyl ceramide cassette acceptor was then applied in the total synthesis of ganglioside GalNAc-GM1b.
Keywords: ganglioside; GalNAc-GM1b; total synthesis; cassette approach ganglioside; GalNAc-GM1b; total synthesis; cassette approach
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Konishi, M.; Imamura, A.; Fujikawa, K.; Ando, H.; Ishida, H.; Kiso, M. Extending the Glucosyl Ceramide Cassette Approach: Application in the Total Synthesis of Ganglioside GalNAc-GM1b. Molecules 2013, 18, 15153-15181.

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