A short-step route to GlcNAc-Cbz-Asn was developed. Treatment of GlcNAc in sat. aq. NH4HCO3 solution and subsequent electorodialytic desalting provided ammonia-free glycosylamine in large quantity. The product was coupled with Cbz-Asn α-isobutyl ester β-fluoride, and finally, the isobutyl ester was deprotected by enzyme-catalyzed hydrolysis under mild conditions.
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