Efficient Synthesis of 1-Arylquinoxalin-2(1<i>H</i>)-ones<i>via</i>Cyclocondensation of<i>N</i>-Aryl-Substituted 2-Nitrosoanilines with Functionalized Alkyl Acetates
作者:Zbigniew Wróbel、Karolina Stachowska、Andrzej Kwast、Agata Gościk、Magdalena Królikiewicz、Robert Pawłowski、Izabela Turska
DOI:10.1002/hlca.201200304
日期:2013.5
N‐Aryl‐substituted 2‐nitrosoanilines (=2‐nitrosobenzenamines) 1, readily available by nucleophilic substitution of the ortho‐H‐atom in nitroarenes with arenamines, react with 2‐substituted acetic acid esters in the presence of a weak base giving 1‐arylquinoxalin‐2(1H)‐ones (Scheme 2). This cyclocondensation allows for the synthesis of compounds 2–4, unsubstituted at C(3) or substituted by alkyl, aryl
N-芳基取代的2-亚硝基苯胺(= 2-亚硝基苯甲胺)1可通过芳烃将硝基芳烃中的邻-H-原子进行亲核取代而容易获得,可在弱碱存在下与2-取代的乙酸酯反应,得到1 -芳基喹喔啉-2(1 H)-1 (方案2)。此环化缩合允许化合物的合成2 - 4,在C(3)未取代的或者被烷基,芳基,酯,酰胺,和酮基取代的,以良好至优异的产率(表1 - 4)。