Partial N-deacetylation of compound II with barium hydroxide afforded benzyl 2-acetamido-3-O-allyl-4-O-(2-amino-2-deoxy-4,6-O-isopropylidene-β-D-glucopyranosyl)-6-O,-benzyl-2-deoxy-α-D-glucopyranoside (III) in high yield. Compound III was N-acylated with stearic acid in the presence of DCC and the obtained product was converted into benzyl 2-acetamido-6-O-benzyl-3-O-carboxymethyl-2-deoxy-4-O-(3,4,6-tri-O-benzyl-2-deoxy-2-stearoylamino-β-D-glucopyranosyl)-α-D-glucopyranoside (VII). Coupling of compound VII with L-α-aminobutanoyl-D-isoglutamine benzyl ester followed by hydrogenolysis of the product VIII afforded compound IX.
用
氢氧化钡部分去乙酰化化合物II,得到
苯甲醇2-乙酰
氨基-3-O-烯丙基-4-O-(2-
氨基-2-脱氧-4,6-O-异丙基-β-
D-葡萄糖吡喃糖基)-6-O-
苯甲醇-2-脱氧-α-
D-葡萄糖吡喃糖苷(III),产率高。在
DCC存在下,化合物III被N酰化为
硬脂酸酯,得到
苯甲醇2-乙酰
氨基-6-O-
苯甲醇-3-O-羧甲基-2-脱氧-4-O-(3,4,6-三-O-
苯甲醇-2-硬脂酰
氨基-β-
D-葡萄糖吡喃糖基)-α-
D-葡萄糖吡喃糖苷(VII)。将化合物VII与L-α-
氨基丁酰-D-异谷
氨酸苯甲酯偶联,随后氢解产物VIII得到化合物IX。