Methanol → Methyl 5-fluoro-2-iodobenzoate
Reaktionsgleichung
[F:1][C:2]1[CH:3]=[CH:4][C:5]([I:11])=[C:6]([CH:10]=1)[C:7]([OH:9])=[O:8].S(=O)(=O)(O)O.[CH3:17]O>>[CH3:17][O:8][C:7](=[O:9])[C:6]1[CH:10]=[C:2]([F:1])[CH:3]=[CH:4][C:5]=1[I:11]Komponenten
4
Reaktionsbedingungen
- Temperatur
- 65 °C
Versuchsvorschrift
To a 500 mL round-bottomed flask was added 5-fluoro-2-iodo-benzoic acid (23 g, 86.5 mmol) in methanol (230 mL). To the resulting solution was added conc. sulfuric acid (2.3 mL, 43.2 mmol). The reaction mixture was warmed to 65° C. and stirred for 15 h. The resulting mixture was concentrated under reduced pressure to give crude product which was then was partitioned between EtOAc (250 mL) and a half sat. Na2CO3(aq) solution (250 mL). The layers were thoroughly mixed and then separated. The organic layer was dried over magnesium sulfate, filtered, and concentrated under reduced pressure to give a yellow oil (23 g, 95% yield). 1H NMR (400 MHz, CDCl3): 7.94 (dd, J=8.7, 5.4 Hz, 1H), 7.54 (dd, J=9.0, 3.1 Hz, 1H), 6.93 (m, 1H), 3.94 (s, 3H).