Rapid Boulton–Katritzky rearrangement of 5-aryl-3-[2-(piperidin-1-yl)ethyl]-1,2,4-oxadiazoles upon exposure to water and HCl
作者:Lyudmila A. Kayukova、Asem B. Uzakova、Anna V. Vologzhanina、Kydyrmolla Akatan、Esbol Shaymardan、Sana K. Kabdrakhmanova
DOI:10.1007/s10593-018-2321-z
日期:2018.6
3-(2-aminoethyl)-5-substituted 1,2,4-oxadiazoles was studied with respect to Boulton–Katritzky rearrangement, which is known to produce planar pyrazolines and pyrazoles upon heating in DMF at 150°C or without solvent at 240°C. The reactivity of 5-aryl-3-[2-(piperidin-1-yl)ethyl]-1,2,4-oxadiazoles in one type of Boulton–Katritzky rearrangement was observed at room temperature in H2O, DMF + H2O, and in the presence
关于Boulton–Katritzky重排,研究了3-(2-氨基乙基)-5-取代的1,2,4-恶二唑的化学稳定性,已知在DMF中加热150°C或不加热,都会产生平面吡唑啉和吡唑溶剂在240°C。在室温下于H 2 O,DMF + H中观察到一种类型的Boulton–Katritzky重排中的5-芳基-3- [2-(哌啶-1-基)乙基] -1,2,4-恶二唑的反应活性2O,并在HCl的存在下。在前两个条件下水解3,5-二取代的1,2,4-恶二唑可得到2-氨基-1,5-二氮杂螺[4.5] dec-1-en-5-鎓苯甲酸酯,而HCl对3 1,5-二取代的1,2,4-恶二唑与2-氨基-1,5-二氮杂螺[4.5] dec-1-en-5-氯化铵水合物一起生成了盐酸盐。因此,该反应提供了螺吡唑啉化合物而不是具有平面结构的产物。