Analysis of linkage positions in 2-acetamido-2-deoxy-d-glucopyranosyl residues by the reductive-cleavage method
作者:John A. Bennek、Michael J. Rice、Gary R. Gray
DOI:10.1016/0008-6215(86)85064-9
日期:1986.12
The fate of methylated 2-acetamido-2-deoxy-D-glucopyranosyl residues under reductive-cleavage conditions was investigated by using methyl 2-(acetylmethylamino)-2-deoxy-3,4,6-tri-O-methyl-beta-D-glucopyran oside (1), its alpha anomer (8), and fully methylated lacto-N-tetraitol as test compounds. Treatment of 1 with triethylsilane and trimethylsilyl trifluoromethanesulfonate in dichloromethane gave rise
甲基化的2-乙酰氨基-2-脱氧-D-吡喃葡萄糖基残基在还原裂解条件下的命运是通过使用甲基2-(乙酰甲基氨基)-2-脱氧-3,4,6-三-O-甲基-β- D-吡喃葡萄糖苷(1),其α端基异构体(8)和完全甲基化的乳酸-N-四醇作为测试化合物。在二氯甲烷中用三乙基硅烷和三氟甲磺酸三甲基甲硅烷基酯处理1产生(1,2-二脱氧-3,4,6-三-O-甲基-α-D-吡喃吡喃)-2,3-二甲基-[2,1- d] -2-三唑甲烷三氟甲磺酸盐。通过加入碳酸氢钠水溶液淬灭反应导致恶唑啉鎓盐的水解。化合物8对还原裂解条件是完全稳定的。因此,要发生糖苷碳-氧键裂解,必须要有2-乙酰氨基基团的参与。在还原裂解条件下处理甲基2-脱氧-2-(乙基甲基氨基)-3,4,6-三-O-甲基-α,β-D-葡萄糖吡喃糖苷会导致一些异构化反应,但不会水解或还原裂解如所预期的,观察到糖苷碳-氧键。完全甲基化的乳酸-N-四醇的还原裂解得到