3-Iodo-5-nitroaniline → 1-Fluoro-3-iodo-5-nitrobenzene

Temperature

0 °C

6-(5-Fluoro-3-nitrophenyl)-1,2-dihydro-2,2,4-trimethylquinoline (Compound 280, structure 4 of Scheme II, where R1 =5-fluoro-3-nitrophenyl) 1-Fluoro-3-nitroidobenzene To a 25 mL round-bottom flask equivuipped with a magnetic stir bar 3-iodo-5-nitroaniline (543.3 mg 2.06 mmol) and methylene chloride (10 mL) were added under nitrogen. Nitrogen was bubbled through the colorless solution for 15 min. The solution was cooled to 0° C. in an ice bath. At that point approximately 500 mg nitrosonium tetrafluoroborate was added in one portion making a cloudy precipitate. The reaction was allowed to continue stirring for 2 hours. The mixture was kept under nitrogen as 10 mL dry, deoxygenated ortho-dichlorobenzene was added. A distillation apparatus was fitted to the reaction flask. The flask was place din an oil bath and was heated until the material had completely distilled over. The crude product was isolated by washing the residue through a short column (74 mL silica, hexane). Purification by silica gel chromatography (74 mL silica, hexane) afforded 279.4 mg (50%) of 5-fluoro-3-nitroiodobenzene. Data for 5-fluoro-3-nitroiodobenzene: 1H NMR (400 MHz, acetone-d6) 8.36 (s, 1 H), 8.00 (m, 2 H).

1. customNitrogen was bubbled through the colorless solution for 15 min
2. additionAt that point approximately 500 mg nitrosonium tetrafluoroborate was added in one portion
3. customdry
4. customdeoxygenated ortho-dichlorobenzene
5. additionwas added
6. customA distillation apparatus was fitted to the reaction flask
7. temperaturewas heated until the material
8. distillationhad completely distilled over
9. customThe crude product was isolated
10. washby washing the residue through a short column (74 mL silica, hexane)
11. customPurification by silica gel chromatography (74 mL silica, hexane)

ORD record

ord-336bbcaa72cc43818d7776744180c2ab

Source dataset

uspto-grants-1999_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05994544