HCID 19877037, compound → HCID 89815347, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 4-amino-2-fluorobenzoate (12 g, 65.5 mmol) in DMF (100 mL) was added NaSMe (9.17 g, 131 mmol) and the mixture was stirred at 60° C. for 20 h. After cooling to rt, the reaction was diluted with H2O and extracted with EtOAc (3×100 mL). The combined organic phases were washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to afford ethyl 4-amino-2-(methylthio)benzoate. To a pre-heated 60° C. solution of ethyl 4-amino-2-(methylthio)benzoate (65 mmol) in acetic acid (150 mL) was added ICl/AcOH solution (1M, 72 mL, 72 mmol) dropwise during 40 min and the temperature was maintained at 60° C. for 3 h. After cooling to rt the reaction was diluted with EtOAc (500 mL) and washed with 5% sodium thiosulfate solution (3×100 mL) and brine (200 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by silica gel chromatography (0-20% EtOAc/Hexanes) to afford ethyl 4-amino-5-iodo-2-(methylthio)benzoate (13.67 g, 53% yield). For ethyl 4-amino-2-(methylthio)benzoate: LC-MS m/z 212 [M+H]+. For ethyl 4-amino-5-iodo-2-(methylthio)benzoate: LC-MS m/z 338 [M+H]+. 1H NMR (400 MHz, CDCl3): δ 8.29 (s, 1H), 6.47 (s, 1H), 4.49 (br s, 2H), 4.31 (q, J=7.2 Hz, 2H), 2.38 (s, 3H), 1.37 (t, J=7.2 Hz, 3H).

Provenance & Evidence