A robust synthetic method for 2-alkylamino-6-carboxy-5,7-diarylcyclopenteno[1,2-b]pyridines via acylamination at the alpha position of the functionalized pyridine system has been developed. The key step in this method was achieved by treatment of the corresponding pyridine N-oxides with 2.5 equiv of imidoyl chlorides in the presence of triethylamine, thus producing the desired 2-acylaminopyridines
已经开发了通过在官能化
吡啶系统的α位上的酰化作用来合成2-烷基
氨基-6-羧基-5,7-二芳基
环戊烯[1,2- b ]
吡啶的稳健合成方法。该方法的关键步骤是在
三乙胺存在下,用2.5当量的亚
氨酰
氯处理相应的
吡啶N-氧化物,从而以较高的收率(74-96%)产生所需的2-酰基
氨基吡啶。