A simple approach for the regioselective synthesis of imidazo[1,2-a]pyrimidiones and pyrimido[1,2-a]pyrimidinones
作者:David Font、Anthony Linden、Montserrat Heras、José M. Villalgordo
DOI:10.1016/j.tet.2005.11.014
日期:2006.2
Several imidazo and pyrimido[1,2-a]pyrimidinones of type 1 and 2 were synthesized through intramolecular cyclization of pyrimidines 9 or pyrimidinones 10 bearing a variety of β and γ-aminoalcohols at the 2-position. Ring closure of the pyrimidinones of type 10 under Mitsunobu conditions lead to mixtures of both bicyclic regioisomers 1 and 2. Treatment of pyrimidines of type 9 with H2SO4 provided an
通过在2位带有各种β和γ-氨基醇的嘧啶9或嘧啶酮10的分子内环化反应,合成了几种类型1和2的咪唑基和嘧啶并[1,2- a ]嘧啶酮。在Mitsunobu条件下10型嘧啶酮的闭环会产生双环区域异构体1和2的混合物。用H 2 SO 4处理9型嘧啶为获得咪唑和嘧啶[1,2- a ]嘧啶酮提供了有效且操作简单的一锅水解-环化程序作为唯一的区域异构双环产物,收率良好,为1。