Stereoselective Ring-Opening of Acetylated Pyranose-1,2-(etyl orthoacetates).
作者:Setsuo SAITO、Shigeya SUMITA、Koki ICHINOSE、Yasuhiko KANDA
DOI:10.1248/cpb.41.90
日期:——
When acetylated pyranose-1, 2-(ethyl orthyl orthoacetates) were hydrolyzed in acidic solvents, the ring-opening of the orthoacetate rings was influenced by the axial or equatorial OAc group at C-4 on the pyranoses; on acid-catalyzed hydrolysis, 3, 4, 6-tri-O-acetyl-α-D-glactopyranose- (8) and methyl 3, 4-di-O-acetyl-α-D-galacturonatopyranose-1, 2-(ethyl orthoacetate) (16) having an axial OAc group at C-4 on the pyranose rings gave 1, 3, 4, 6-tetra-O-acetyl-α-D-galactopyranose (9) and methyl 1, 3, 4-tri-O-acetyl-α-D-galacturonatopyranose (23), respectively, whereas 3, 4, 6-tri-O-acetyl-α-D-glucopyranose- (10) and methyl 3, 4-di-O-acetyl-α-D-glucuronatopyranose-1, 2-(ethyl orthoacetate) (22)having an equatorial OAc group at C-4 on the pyranose rings gave 2, 3, 4, 6-tetra-O-acetyl-D-glucopyranose (11) and methyl 2, 3, 4-tri-O-acetyl-D-glucuronatopyranose (24), respectively. On the acid-catalyzed hydrolysis, 3, 4-di-O-acetyl-β-L-arabinopyranose-1, 2-(ethyl orthoacetate) (34) having an axial OAc group at C-4 on the pyranose ring gave a mixture of 1, 3, 4-tri-O-acetyl-β-L- (35) and 2, 3, 4-tri-O-acetyl-L-arabinopyranose (36). These selectivities of ring-opening of the 1, 2-(orthoacetates) were considered to have resulted from the differences of the conformers fo the 1, 2-(orthoacids)intermediates derived from the 1, 2-(othoacetates) and the orientation of the acetyl groups at C-4 on the pyranose rings.
当乙酰化的吡喃糖1,2-(乙基邻酸酯)在酸性溶剂中水解时,邻酸酯环的开环受吡喃糖C-4位点的轴向或赤道OAc基团的影响;在酸催化水解过程中,具有C-4轴向OAc基团的3,4,6-三-O-乙酰-α-D-半乳糖吡喃糖-(8)和甲基3,4-二-O-乙酰-α-D-半乳糖酸吡喃糖-1,2-(乙基邻酸酯)(16)分别生成1,3,4,6-四-O-乙酰-α-D-半乳糖吡喃糖(9)和甲基1,3,4-三-O-乙酰-α-D-半乳糖酸吡喃糖(23),而具有C-4赤道OAc基团的3,4,6-三-O-乙酰-α-D-葡萄糖吡喃糖-(10)和甲基3,4-二-O-乙酰-α-D-葡萄糖醛酸吡喃糖-1,2-(乙基邻酸酯)(22)则分别生成2,3,4,6-四-O-乙酰-D-葡萄糖吡喃糖(11)和甲基2,3,4-三-O-乙酰-D-葡萄糖醛酸吡喃糖(24)。在酸催化水解过程中,具有C-4轴向OAc基团的3,4-二-O-乙酰-β-L-阿拉伯糖吡喃糖-1,2-(乙基邻酸酯)(34)生成1,3,4-三-O-乙酰-β-L-(35)和2,3,4-三-O-乙酰-L-阿拉伯糖吡喃糖(36)的混合物。这些1,2-(邻酸酯)的开环选择性被认为是由1,2-(邻酸)中间体的构象差异以及吡喃糖环上C-4位置的乙酰基团的取向所导致的。