Synthesis of 2-imino-7-methyl-2,3-dihydroimidazo[1,2-<i>a</i>]-pyrimidin-5(1<i>H</i>)-ones and their reactions with nucleophiles
作者:Virginija Jakubkiene、Zana Kacnova、Milda M. Burbuliene、Povilas Vainilavicius
DOI:10.1002/jhet.5570450522
日期:2008.9
by ammonium chloride were cyclized to 2-imino-7-methyl-2,3-dihydroimidazo[1,2-a]-pyrimidin-5(1H)-ones (6-8). Under acid or base-catalyzed hydrolysis they were converted to 7-methyl-imidazo[1,2-a]pyrimidine-2,5-[1H,3H]-diones (9-11), whereas in the reaction with butyl- or benzylamine the corresponding 7-methyl-2-(substitutedamino)imidazo[1,2-a]pyrimidin-5(3H)-ones (13-18) were produced. The latter were
在甲醇中先用甲醇钠然后用氯化铵处理的[2-烷硫基-6-甲基-4-氧嘧啶丁-3(4 H)-基]乙腈(3-5)被环化成2-亚氨基-7-甲基-2, 3-二氢咪唑并[1,2- a ]-嘧啶-5(1 H)-ones(6-8)。在酸或碱催化的水解下,它们转化为7-甲基-咪唑并[1,2- a ]嘧啶-2,5- [1 H,3 H ]-二酮(9-11),而在与丁基的反应中-或苄胺相应的7-甲基-2-(取代氨基)咪唑并[1,2- a ]嘧啶-5(3 H)-一(13-18)产生。发现后者在CDCl 3溶液中以两种互变异构形式存在。