Mechanistic Evidence for Mild Base-Mediated Intermolecular Trans-Aminoacylations of 1-Acyl-5-amino-1<i>H</i>-1,2,4-triazoles and 5-Amino-1<i>H</i>-1,2,4-triazoles to Afford 5-Acylamino-1<i>H</i>-1,2,4-triazoles
作者:Nicholas A. Magnus、Natalie G. Franklin-Charlesworth、Jesús González、James C. Muir
DOI:10.1021/acs.oprd.4c00029
日期:2024.4.19
at the ring 1-position of the heterocycle to give 1-acyl-5-amino-1H-1,2,4-triazoles. Thermal rearrangement of 1-acyl-5-amino-1H-1,2,4-triazoles has required high temperatures and concentrated to neat conditions to produce 5-acylamino-1H-1,2,4-triazoles. The mechanism of this rearrangement was thought to be intramolecular and later proposed to be intermolecular based on concentration effects. This work
5-氨基-1 H -1,2,4-三唑的酰化对于杂环的环1位上的氮原子是选择性的,得到1-酰基-5-氨基-1 H -1,2,4-三唑类。 1-酰基-5-氨基-1 H -1,2,4-三唑的热重排需要高温并浓缩至纯净条件才能产生5-酰基氨基-1 H -1,2,4-三唑。这种重排的机制被认为是分子内的,后来根据浓度效应提出是分子间的。这项工作表明碱可以在温和条件下促进这种重排,交叉实验支持分子间转氨酰化机制。