A reversal of the standard regiochemistry of the Skraup−Doebner−Von Miller quinoline synthesis was observed when anilines were condensed with γ-aryl-β,γ-unsaturated α-ketoesters in refluxing TFA. The reaction is proposed to involve 1,2-addition of the anilines to γ-aryl-β,γ-unsaturated α-ketoesters to form Schiff's base adducts, followed by cyclization and oxidation. The products were unambiguously
当
苯胺与回流的TFA中的γ-芳基-β,γ-不饱和α-
酮酸酯缩合时,观察到了Skraup-Doebner-Von Miller
喹啉合成的标准区域
化学的逆转。建议该反应包括将
苯胺1,2-加成到γ-芳基-β,γ-不饱和的α-
酮酸酯上,形成席夫碱加合物,然后环化和氧化。通过光谱法和X射线晶体学分析将产物明确显示为2-羧基-4-芳基
喹啉。