Synthesis of 5-aryl-3-C-glycosyl- and unsymmetrical 3,5-diaryl-1,2,4-triazoles from alkylidene-amidrazones
作者:Béla Szőcs、Éva Bokor、Katalin E. Szabó、Attila Kiss-Szikszai、Marietta Tóth、László Somsák
DOI:10.1039/c5ra05702g
日期:——
Bromination of the so obtained compounds by NBS gave hydrazonoyl bromide type derivatives which were ring closed to 3-C-glycosyl-5-substituted-1,2,4-triazoles in pyridine or by NH4OAc in AcOH. Under the same conditions O-perbenzoylated N1-arylidene-C-(β-D-glucopyranosyl)-formamidrazones gave the expected 1,2,4-triazoles as minor products only. N1-Arylidene-arenecarboxamidrazones were also transformed
在具有多种生物活性的1,2,4-三唑衍生物中,3 - C-吡喃葡萄糖基-5-取代的1,2,4-三唑属于糖原磷酸化酶的最有效抑制剂,因此是潜在的降糖药。在寻找用于这类化合物的新的合成方法中,研究了N 1-亚烷基羧酰胺dra的氧化性闭环。在NaH 2 PO 2存在下,通过Raney-Ni®还原反应,由相应的糖基氰化物和酰氨基prepared酰胺制备O-酰化的N 1-(β- D-甘氨酸金烷基糖基亚甲基)-芳族羧酰胺基酮。通过NBS对如此获得的化合物进行溴化得到了酰肼基溴化物型衍生物,其在吡啶中或在AcOH中通过NH 4 OAc与3- C-糖基-5-取代-1,2,4-三唑闭环。在相同条件下ø -perbenzoylated Ñ 1 -arylidene- Ç - (β- d吡喃葡萄糖基)-formamidrazones给出预期的-1,2,4-三唑作为只有轻微的产品。N 1-亚芳基-亚芳基甲酰胺还与NBS