Unexpected cleavage of C–S bond in the hydrazination of 2-((3,5-di- tert -butyl-4-hydroxybenzyl)thio) nicotinate: synthesis and mechanistic studies by kinetic and computational approaches
作者:Nurdiana Nordin、Azhar Ariffin、Mohammad Noh Daud、Yoke-Leng Sim
DOI:10.1016/j.tet.2015.10.077
日期:2016.2
material in alcoholic solution by hydrazine hydrate did not lead to the expected products. Unexpected C–S bond cleavage was observed that produced two compounds, 2-thioxo-1,2-dihydro-pyridine-3-carboxylic acid hydrazide, and 2,6-di-tert-butyl-4-hydrazinomethylphenol. A kinetic and a computational DFT studies were carried out in order to propose a rational mechanism.
由2-巯基烟酸和2,6-二叔丁基-4-羟基-苄基醇成功合成了2-(((3,5-二叔丁基-4-羟基苄基)硫代)甲基烟酸酯。酯的酰肼化是制备酰基酰肼,2-(3,5-二叔丁基-4-羟基-苄基硫烷基)-烟酸酰肼的常规方法。但是,尝试通过水合肼在醇溶液中合成原料并没有得到预期的产物。观察到意外的C–S键断裂,产生了两种化合物,即2-thioxo-1,2-二氢吡啶-3-羧酸酰肼和2,6-二叔丁基-4-肼基甲基苯酚。为了提出一个合理的机制,进行了动力学和计算的DFT研究。