Syntheses of nephritogenoside and related compounds

Nephritogenoside has been prepared by coupling of the acyl azide derivative of a N-triglycosyl dipeptide, derived from the corresponding hydrazide derivative of O-(2,3,4,6-tetra-O-acetyl-alpha-D-glucopyranosyl)-(1-->6)-O-(2,3,4-tri-O -acetyl - beta-D-glucopyranosyl)-(1-->6)-2,3-di-O-benzyl-1-N-[N-(tert-butoxycarbon yl)- L-aspart-1-oyl-(L-proline methyl ester)-4-oyl]-alpha-D-glucopyranosylamine, with a nonadecapeptide, followed by deprotection of the desired protected nephritogenoside. The N-triglycosyl pentapeptide also has been prepared as a model compound.