Synthesis of dermatan sulfate fragments: A chemical synthesis of methyl 2-acetamido-2-deoxy-3-O-(α-lidopyranosyluronic acid)-4-O-sulfo-β-d-galactopyranoside disodium salt and its non-sulfated analogue
作者:Jean-Claude Jacquinet、Pierre Sinaÿ
DOI:10.1016/s0008-6215(00)90218-0
日期:1987.2
isopropylidenation, benzylation, acid hydrolysis, and selective acetylation of HO-4, to give amorphous methyl 4-O-acetyl-2-azido-6-O-benzyl-2-deoxy-β- d -galactopyranoside. Condensation with 2,3,4-tri-O-benzyl-6-O-chloroacetyl-α- l -idopyranosyl chloride (easily prepared in three steps from known 1,6-di-O-acetyl-2,3,4-tri-O-benzyl- l -idopyranose) in 1,2-dichloroethane, in the presence of 2,4,6-trimethylpyridine
摘要对甲基2-叠氮基-2-脱氧-β-d-吡喃半乳糖苷依次进行HO-4的异丙基化,苄基化,酸解和选择性乙酰化反应,得到无定形的甲基4-O-乙酰基-2-叠氮基-6 -O-苄基-2-脱氧-β-d-吡喃半乳糖苷。与2,3,4-三-O-苄基-6-O-氯乙酰基-α-1-氨基吡喃糖基氯的缩合反应(由已知的1,6-二-O-乙酰基-2,3,4-容易地分三步制备在1,2-二氯乙烷中,在2,4,6-三甲基吡啶,三氟甲磺酸银和分子筛存在下,在1,2-二氯乙烷中提供58%的无定形甲基4- O-乙酰基-2-叠氮基-6-O-苄基-2-脱氧-3-O-(2,3,4-三-O-苄基-α-1-基吡喃糖基)-β-d-吡喃半乳糖苷。用硼氢化钠还原,然后依次进行N-乙酰化,在三氧化铬存在下于丙酮-硫酸中氧化,用三氧化硫-三甲胺络合物对钠盐进行O-硫酸化,然后催化氢解,得到甲基2-乙酰氨基-2-脱氧-3-O-(α-1-基吡喃糖基尿嘧啶酸)-4-O的二钠盐。