作者:Aleksandr N. Shestakov、Alena S. Pankova、Pavel Golubev、Alexander F. Khlebnikov、Mikhail A. Kuznetsov
DOI:10.1016/j.tet.2017.05.070
日期:2017.7
A high-yielding procedure for the synthesis of 5-aryl-4-(arylethynyl)pyrimidines from easily available 2-aryl-3-hydroxyacrylates is reported. These pyrimidines readily undergo cyclization in strong Brønsted acids and, depending on the substitution in alkynylpyrimidines and the water content of the reaction mixture, yield either benzo[f]quinazolines or derivatives of spiro[cyclohexa-2,5-diene-1,5′-
据报道,由容易获得的2-芳基-3-羟基丙烯酸酯合成5-芳基-4-(芳基乙炔基)嘧啶的高产率方法。这些嘧啶易于在强布朗斯台德酸中环化,并且取决于炔基嘧啶中的取代基和反应混合物的水含量,可生成苯并[ f ]喹唑啉或螺[环己-2,5-二烯-1,5'的衍生物-cyclopenta [ d ]嘧啶] -4-一。在大多数情况下,环化几乎是定量进行的。DFT计算支持由5-芳基-4-(芳基乙炔基)嘧啶中的三键质子化诱导的拟议机理。还描述了所获得的杂环的荧光性质。