A Facile Synthesis of an Oxazolo[5,4]pyrimidin-2-one and a Pyrimido[5,4][1,3]oxazin-2-one
作者:Caroline Springer、Harmen Dijkstra、Catherine Gaulon、Dan Niculescu-Duvaz
DOI:10.1055/s-2006-941604
日期:2006.6
A facile synthesis is reported for the construction of the five- and six-membered fused carbamate rings of an oxazolo[5,4]pyrimidin-2-one and a pyrimido[5,4][1,3]oxazin-2-one, respectively. The method utilises a controlled two-step procedure in which a reactive p-nitrophenylcarbamate intermediate ring closes upon treatment with base, affording the bicyclic pyrimidine-carbamate scaffolds in good yields.
据报道,一种简单的合成方法可构建恶唑并[5,4]嘧啶-2-酮和嘧啶并[5,4][1,3]恶嗪-2-酮的五元和六元稠合氨基甲酸酯环, 分别。该方法采用受控的两步程序,其中反应性对硝基苯基氨基甲酸酯中间环在用碱处理后闭合,以良好的产率提供双环嘧啶-氨基甲酸酯支架。