Synthesis of p-trifluoroacetamidophenyl 6-deoxy-2-O-3-O- [2-O-methyl-3-O-(2-O-methyl-α-d-rhamnopyranosyl)- α-l-fucopyranosyl]-α-l-rhamnopyranosyl-α-l- talopyranoside: a spacer armed tetrasaccharide glycopeptidolipid antigen of Mycobacterium avium serovar 20
作者:János Kerékgyártó、Zoltán Szurmai、András Lipták
DOI:10.1016/0008-6215(93)80060-r
日期:1993.7
O -benzyl-1-thio-α- l -rhamnopyranoside ( 9 ), affording the same disaccharide derivative 8 . Deacetylation of 8 gave crystalline 17 . Condensation of 17 with both fucosyl donors 15 and 16 yielded the same trisaccharide derivative 18 stereoselectively. Compound 18 was also prepared by the coupling of 4 with disaccharide glycosyl donor 20 . After deacetylation of 18 (→ 34 ), methyl triflate-promoted
摘要报道了标题四糖苷38的合成。对-硝基苯基内酯-3,4- O-亚苄基-6-脱氧-α-1-塔拉吡喃糖苷(4,3-O-乙酰基-2,4-二-O-苄基-α-1-鼠李糖基吡喃糖基三氯乙酰亚氨酸盐(7)甲基3-O-乙酰基-4-O-苄基-2-O-甲基-1-硫代-β-1-呋喃核糖苷(15)3-O-乙酰基-4-O-苄基-2-O-甲基-制备了α-1-呋喃核糖基溴化物(16)和乙基3-O-乙酰基-4-O-苄基-2-O-甲基-1-硫代-α-d-鼠李糖吡喃糖苷(33)作为化合物4。用亚氨酸酯7以及3-- O-乙酰基-2,4-二-O-苄基-1-硫代-α-1-L-鼠李糖吡喃糖苷(9)进行糖基化,得到相同的二糖衍生物8。图17.将17与岩藻糖基供体15和16两者缩合,立体选择性地产生相同的三糖衍生物18。还通过将4与二糖糖基供体20偶联来制备化合物18。18(→34)脱乙酰基后,三氟甲磺酸甲酯与化合物33的糖基化反应产