Dichloromethane → 1-Bromo-4-fluoro-2-methyl-5-nitrobenzene

To a mixture of nitronium tetrafluoroborate (11.6 g; 87.0 mmol) and CH2Cl2 (60.0 mL) was added 2-bromo-5-fluoro toluene (15.0 g, 10.0 mL, 79.0 mmol) over 5 min. After refluxing for 4.5 h, the mixture was cooled to room temperature and poured into ice water (150 mL). The mixture was extracted with CH2Cl2 (3×50 mL). The combined organic layers were washed with brine (100 mL), dried over Na2SO4, filtered and concentrated to give 18.3 g of crude product. The crude product was treated with hexane and cooled to −70° C. then the hexane was decanted away from the resulting solid to give the desired product as a semi-solid (9.77 g, 53% yield). The mother liquors were concentrated in vacuo and purified by flash column chromatography (eluent: 2% EtOAc in Hexane) to give the desired product (1.0 g). 1H NMR (CDCl3) δ 8.26 (d, J=6.9 Hz, 1H), 7.20 (d, J=11.7 Hz, 1H), 2.48 (s, 3H).

1. temperatureAfter refluxing for 4.5 h
2. extractionThe mixture was extracted with CH2Cl2 (3×50 mL)
3. washThe combined organic layers were washed with brine (100 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto give 18.3 g of crude product
8. temperaturecooled to −70° C.
9. customthe hexane was decanted away from the resulting solid

ORD record

ord-5b4b436d87994a888eaf59835e772dc4

Source dataset

uspto-grants-2008_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07329656B2