Preparation and calculated conformations of the 2′-, 3′-, 4′-, and 6′-deoxy, 3′-O-methyl, 4′-epi, and 4′- and 6′-deoxyfluoro derivatives of methyl 4-O-α-d-galactopyranosyl-β-d-galactopyranoside (methyl β-d-galabioside)
作者:Jan Kihlberg、Torbjörn Frejd、Karl Jansson、Susanna Kitzing、Göran Magnusson
DOI:10.1016/0008-6215(89)80033-3
日期:1989.2
deprotection, the 6′-deoxy ( 31 ), 3′-deoxy ( 34 ), and 4′-deoxy ( 37 ) derivatives of 1 , respectively. The 2′-deoxy ( 41 ) derivative of 1 was prepared by N -iodosuccinimide-induced condensation of 3,4,6-tri- O -acetyl- d -galactal and 21 followed by deprotection. Treatment of methyl 2,3,6-tri- O -benzoyl-4- O -(2,3-di- O -benzoyl-α- d -galactopyranosyl)-β- d -galactopyranoside with Et 2 NSF 3 (DAST), followed
摘要d-吡喃半乳糖的3-O-甲基(6)和4-脱氧-4-氟(8)O-苄基衍生物和2,3,4,6-四-O-苄基-d-的糖基氯化物吡喃葡萄糖与2,3,6-三-O-苯甲酰基-β-d-吡喃半乳糖苷甲基缩合,脱保护后得到3'-O-甲基(23),4'-脱氧-4'-氟(25 )和4'-epi(27)衍生物分别是甲基β-d-Galabioside(1)。将2,3,4-三-O-苄基-d-呋喃果糖的糖基氟化物和d-半乳糖基吡喃糖的3-脱氧(12)和4-脱氧(16)O-苄基化衍生物与2,3,3,2-甲基丙二醇缩合, 6-三-O-苄基-β-d-吡喃半乳糖苷(21),在脱保护后得到6'-脱氧(31),3'-脱氧(34)和4'-脱氧(37)衍生物分别为1。1的2'-脱氧(41)衍生物是通过N-碘琥珀酰亚胺诱导的3,4,6-三-O-乙酰基-d-半乳糖和21的缩合反应,然后脱保护而制备的。用Et 2 NSF 3(DAST)处理甲基2