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Beilstein J. Org. Chem. 2019, 15, 2156–2160, doi:10.3762/bjoc.15.212
Graphical Abstract
Scheme 1: The effect of indole substituents on the yields of ethyl quinoline-3-carboxylates [15]. Green = good, o...
Figure 1: Quinolone 3-carboxylate scaffold, norfloxacin (1) and ciprofloxacin (2).
Scheme 2: Retrosynthetic outline for the synthesis of quinolone-3-carboxlates from indole derivatives.
Scheme 3: Synthesis of ethyl 4-quinolone-3-carboxylate (6) and proposed mechanism. a: Rh2(esp)2 (1 mol %), CH2...
Scheme 4: Synthesis of norfloxacin. a: Cl-EDA (1.3 equiv), Rh2(esp)2 (1 mol %), toluene, rt, Cs2CO3, 75%. b: ...