An Unexpected Pyrimidine Ring Transformations in the Reaction of 4-aryl-5-nitro-6-bromomethylpyrimidin-2(1<i>H</i>)-ones with Anilines
作者:Grigoriy Ya Remennikov、Andrey Gavryushin、Kurt Polborn
DOI:10.1002/jhet.2326
日期:2016.3
4‐aryl‐6‐bromomethyl‐5‐nitro‐3,4‐dihydropyrimidin‐2(1H)‐ones, containing three possible combinations of substituted and unsubstituted nitrogen atoms with anilines depending on the conditions leads to the products of ring contraction of the pyrimidinone ring into an imidazolone, as well as to the formation of 7‐aryl‐6,7‐dihydroisoxazolo[4,3‐d]pyrimidin‐5(4H)‐one derivatives, and in some cases to the 5‐aminopyrimidinones
4-芳基-6-溴甲基-5-硝基-3,4-二氢嘧啶-2(1 H)-1的反应,视条件而定,包含取代和未取代的氮原子与苯胺的三种可能组合,产生以下产物:嘧啶酮环的环收缩成咪唑酮,以及形成7-芳基-6,7-二氢异恶唑并[4,3-d]嘧啶-5(4 H)-one衍生物,在某些情况下还包括5-氨基嘧啶。讨论了这些异常环转化的机理。