Patent ID: 8404833

Claim:
A disaccharide building block of General Formula XX, wherein: X 2 is selected from the group consisting of a hydroxyl group; thioalkyl, thioaryl, halogen, trichloroacetimidoyl, and a t butyldiphenylsilyloxy, and wherein the stereochemistry may be alpha or beta; R P1 is selected from the group consisting of 4-methoxyphenyl, benzyl, substituted benzyl groups, alkylacyl, arylacyl and alkylarylacyl, or substituted alkylacyl, arylacyl and alkylarylacyl protecting groups, and carbonate protecting groups; R P2 is selected from the group consisting of 4-methoxyphenyl, alkylacyl, arylacyl and alkylarylacyl, or substituted alkylacyl, arylacyl and alkylarylacyl protecting groups, carbonate protecting groups, carbamate protecting groups, and C 3 -C 5 alkenyl; R E1 is selected from the group consisting of methyl, C 2 -C 5 alkyl, substituted C 2 -C 5 alkyl, C 3 -C 5 alkenyl, benzyl and substituted benzyl groups; R B1 is selected from the group consisting of an azido function, an amine, an NH-Dde and an NH-DTPM group, or R H2 and R B1 can combine together to form a cyclic carbamate; R H is benzyl; R H2 is selected from the group consisting of benzyl, substituted benzyl protecting group, allyl, and allyloxycarbonyl, or R H2 and R B1 independently can combine together to form a cyclic carbamate; and R S5 is selected from the group consisting of benzoyl, arylacyl or alkylarylacyl, and substituted alkylacyl, 4-chlorobenzoyl, arylacyl or alkylarylacyl protecting groups, allyloxycarbonyl, ethoxycarbonyl, tertbutoxycarbonyl, carbonate protecting groups, a t butyldiphenylsilyl, allyl, methoxymethyl, methoxyethyl, and benzyloxymethyl.