Four new difluorosugar fluorides, 2-deoxy-2,5-difluoro-α-l-idopyranosyl fluoride, 1,5-difluoro-d-glucopyranosyl fluoride, 1,5-difluoro-l-idopyranosyl fluoride, and 2-deoxy-1,2-difluoro-d-glucopyranosyl fluoride, were synthesized from known precursors by a radical bromination/fluoride displacement sequence, followed by deprotection. The compounds were tested as time-dependent inactivators of the β-glucosidase from Agrobacterium sp. (Abg, EC 3.2.1.21) and, while they were shown to bind to the enzyme active site as reversible competitive inhibitors, the only time-dependent inactivation observed was traced to the presence of an extremely small amount (<0.1%) of a highly reactive contaminating impurity.
通过自由基
溴化/
氟置换顺序,从已知前体合成了四种新的二
氟糖类氟化物,即 2-脱氧-2,5-二
氟-α-l-
吡喃
核糖基
氟化物、1,5-二
氟-d-
吡喃
葡萄糖基
氟化物、1,5-二
氟-l-
吡喃
核糖基
氟化物和 2-脱氧-1,2-二
氟-d-
吡喃
葡萄糖基
氟化物,然后进行了脱保护。这些化合物作为农杆菌(Abg,
EC 3.2.1.21)β-
葡萄糖苷酶的时间依赖性灭活剂进行了测试,结果表明,这些化合物作为可逆竞争性
抑制剂与酶活性位点结合,唯一观察到的时间依赖性灭活现象可追溯到极少量(0.1%)高活性污染杂质的存在。