The 4-deoxy-4-C-sulfonic acid and 6-deoxy-6-C-sulfonic acid derivatives of methyl α-d-gluco- and α-d-galactopyranosides were prepared by triflate-mediated nucleophilic displacement reactions, either with NaHSO3 or with AcSK. The triflate esters of methyl 2,3,4-tri-O-benzyl- 1, methyl 2,3,6-tri-O-benzyl-α-d-glucopyranoside 9 and methyl 2,3,6-tri-O-benzyl-α-d-galactopyranoside 5 provided methyl 6-de
通过
三氟甲磺酸酯介导的亲核取代反应,或者用NaHSO 3制备α-d-
葡萄糖基和α-d-
吡喃半
乳糖苷甲基的4-deoxy-4- C-
磺酸和6-deoxy-6- C-
磺酸衍
生物。3或使用AcSK。甲基
三氟甲磺酸酯的酯2,3,4-三ø苄基1,甲基2,3,6-三- ö苄基α-d-
D-吡喃葡萄糖苷9和甲基2,3,6-三- ø -苄基-α-d-
吡喃半
乳糖苷5提供了甲基6-脱氧-6- C-磺基-α-d-
吡喃
吡喃糖苷4,甲基4-脱氧-4- C-磺基-α-d-
吡喃半
乳糖苷12和α-
D-吡喃葡萄糖ef=https://www.molaid.com/MS_187149 target="_blank">吡喃
葡萄糖苷8。甲基2,3,4-三-O-苄基-α-d-
吡喃半
乳糖苷13的
三氟甲磺酸衍
生物得到甲基3,6-脱
水-2,4-二-O-苄基-α-d-
吡喃半
乳糖苷14。通过使用3,4- O-异亚丙基
缩醛保护防止甲基3,6-脱
水衍
生物的形成以获得甲基6-脱氧-6- C-磺基-α-d-
吡喃半
乳糖苷19。该研究的目的是在糖胺聚糖的重复
寡糖单元