1: indole-2,3-dione With potassium hydroxide in water
T=20°C; Pfitzinger Quinoline Synthesis;
2: butanone With hydrogenchloride; CuSO4‵5H2O in water
T=20°C; Pfitzinger Quinoline Synthesis; pH=3 - 4;
Abdel Rahman; El Gendy; Mahmoud
Indian Journal of Chemistry - Section B Organic Chemistry Including Medicinal Chemistry, 1990 , vol. 29, # 4 p. 352 - 358