Cascade synthesis of substituted 4-amino-1,2,4-triazol-3-ones from aldehyde hydrazones and azodicarboxylates
作者:Yehua Su、Zhen Jiang、Deng Hong、Ping Lu、Yanguang Wang、Xianfu Lin
DOI:10.1016/j.tet.2010.01.087
日期:2010.3
Substituted 4-amino-1,2,4-triazol-3-ones were synthesized from aldehyde hydrazones and azodicarboxylates in the presence of triphenylphosphine. The cascade reaction was conducted in a single step and the procedure is general and efficient. (C) 2010 Elsevier Ltd. All rights reserved.
Mechanisms of the cascade synthesis of substituted 4-amino-1,2,4-triazol-3-one from huisgen zwitterion and aldehyde hydrazone: A DFT study
the nucleophilic attack, and the AA‐Type transfer strategy is more likely to occur. The global reactivity index (GRI) and frontier molecular orbital (FMO) analyses of the aldehydehydrazone have further supported the AA‐Type mechanism. In process (IV), however, the titled product has been demonstrated to be formed by the synergetic elimination of two protons via a six‐membered ring transition state. Taking