Mechanistic aspect of ring transformations in the reaction of 5-nitro-4-pyrimidinone with acetophenone derivatives and cycloalkanones depending on the electron density/ring size of the ketone
作者:Nagatoshi Nishiwaki、Ryuichi Sugimoto、Kazuhiko Saigo、Kazuya Kobiro
DOI:10.1016/j.tetlet.2012.12.020
日期:2013.2
idinone undergoes two kinds of nucleophilic type ring transformations upon treatment with cycloalkanones in the presence of ammonium acetate, which affords 4,5-disubstituted pyrimidines and 5,6-disubstituted 3-nitro-2-pyridones. In order to improve the synthetic utility of this reaction, it is necessary to control the regioselectivity of these ring transformations. In the present work, we performed
3-甲基-5-硝基-4-嘧啶酮在乙酸铵存在下用环烷酮处理后会经历两种亲核型环转化,生成4,5-二取代的嘧啶和5,6-二取代的3-硝基-2-吡啶酮。为了提高该反应的合成效用,必须控制这些环转化的区域选择性。在目前的工作中,我们进行了DFT计算以实现两个环转化产物的选择性。在衍生自环己酮和环辛酮的加合物中间体的情况下,优选进行2-攻击以得到缩合的嘧啶。另一方面,衍生自环庚酮的加合物中间体主要经历4-攻击,从而得到缩合的硝基吡啶酮。