Synthetic receptor analogues: preparation and calculated conformations of the 2-deoxy, 6-O-methyl, 6-deoxy, and 6-deoxy-6-fluoro derivatives of methyl 4-O-α-d-galactopyranosyl-β-d-galactopyranoside (methyl β-d-galabioside)
作者:Jan Kihlberg、Torbjörn Frejd、Karl Jansson、Anders Sundin、Göran Magnusson
DOI:10.1016/0008-6215(88)80138-1
日期:1988.5
2-deoxy (7), 6-O-methyl (15), 6-deoxy (22), and 6-deoxy-6-fluoro (31) derivatives of methyl beta-D-galabioside (1) have been synthesised. Thus, 7 was prepared by xanthate reduction using tributyltin hydride, whereas 22 was obtained by catalytic hydrogenation of a 6-deoxy-6-iodogalabioside. Regioselective monofluorination of methyl 2,3-di-O-benzoyl-beta-D-galactopyranoside with Et2NSF3 and subsequent
已经合成了甲基β-D-galabioside(1)的2-deoxy(7),6-O-甲基(15),6-deoxy(22)和6-deoxy-6-氟(31)衍生物。因此,通过使用氢化三丁基锡的黄药还原来制备7,而通过6-脱氧-6-碘杂十二碳五烯苷的催化氢化获得22。2,3,2-二-O-苯甲酰基-β-D-吡喃半乳糖甲基与Et2NSF3的区域选择性单氟化和随后的α-D-半乳糖基化提供了31.分子力学计算得出1、7、15、22和31的构象相似,不同之处在phi H和psi H小于5度的情况下。没有发现7、15、22或31的分子内氢键的迹象,如晶体中的1所示。