Synthesis of α-substituted 2-(1H-1,2,4-triazol-3-yl)acetates and 5-amino-2,4-dihydro-3H-pyrazol-3-ones via the Pinner strategy
作者:Dmytro M. Khomenko、Roman O. Doroshchuk、Hanna V. Ivanova、Borys V. Zakharchenko、Ilona V. Raspertova、Oleksandr V. Vaschenko、Sergiu Shova、Alexey V. Dobrydnev、Yurii S. Moroz、Oleksandr O. Grygorenko、Rostyslav D. Lampeka
DOI:10.1016/j.tetlet.2021.152956
日期:2021.4
A series of 2-(1H-1,2,4-triazol-3-yl)acetates, as well as 4-mono- and 4,4-disubstituted 5-amino-2,4-dihydro-3H-pyrazol-3-ones (including spirocyclic derivatives) have been synthesized using the Pinner reaction strategy. α-Mono- and α,α-disubstituted ethyl cyanoacetates were converted into the corresponding carboxyimidate salts that served as the key intermediates. Their further reaction with formylhydrazide
一系列 2-(1 H -1,2,4-三唑-3-基)乙酸酯,以及 4-单-和 4,4-二取代 5-氨基-2,4-二氢-3 H-吡唑-3-酮(包括螺环衍生物)已使用 Pinner 反应策略合成。 α-单取代和α,α-二取代氰基乙酸乙酯被转化为相应的羧基亚氨酸盐,作为关键中间体。它们与甲酰肼或水合肼进一步反应,得到乙酸三唑酯或氨基吡唑啉酮(包括螺环衍生物),具体取决于起始平纳盐的结构和亲核试剂的性质。所开发的合成方法的范围和局限性已经确定。