Several pyrimido[4,5-b]quinolines, flavin analogues, have been prepared by assisted microwave intramolecular cyclization of N4-substituted-2,4-diamino-6-chloropyrimidine-5-carbaldehydes. The reaction takes place with hydrolysis of amino-group and chlorine. Particularly valuable features of this method included the broader substrate scope and operational simplicity as well as increased safety for small-scale
通过N 4取代的2,4-二氨基-6-氯嘧啶-5-甲醛的微波辅助分子内环化反应,已经制备了几种嘧啶[4,5- b ]喹啉,黄素类似物。该反应在氨基和氯的水解下进行。该方法特别有价值的特征包括更宽的基板范围和操作简便性,以及用于小规模高速合成的更高的安全性。
(<i>E</i>)-3-{2-Amino-4-ethoxy-6-[<i>N</i>-(4-methoxyphenyl)-<i>N</i>-methylamino]pyrimidin-5-yl}-1-phenylprop-2-en-1-one: a boat-shaped pyrimidine ring and a chain of hydrogen-bonded<i>R</i><sup>4</sup><sub>2</sub>(8) and<i>R</i><sup>2</sup><sub>2</sub>(20) rings
作者:Jorge Trilleras、Jairo Quiroga、John N. Low、Justo Cobo、Christopher Glidewell
DOI:10.1107/s0108270107056569
日期:2007.12.15
In the title compound, C23H24N4O3, the pyrimidine ring adopts an almost perfect boat conformation, and the bond distances provide evidence for some polarization of the molecular-electronic structure. Two independent N-H center dot center dot center dot O hydrogen bonds link the molecules into chains of edge-fused R-4(2)(8) and R-2(2)(20) rings.