Sodium Bromide → 4-Bromo-3-iodotoluene

To a mixture of 2-iodo-4-methylaniline (50 g, 214.55 mmol) in HOAc (250 mL), H2SO4 (10 mL), and H2O (40 mL) was added a solution of NaNO2 (14.5 g) in H2O (80 mL) at 0° C. The solution was stirred for 1.5 h. This was defined as mixture A. In another round bottom flask, a mixture of NaBr (107 g), CuSO4 (32.2 g), Cu (38.9 g), H2SO4 (39 mL), and H2O (25 mL) was refluxed for 1.5 h. To this mixture was added mixture A, and the solution was then refluxed for 3 h. The solution was treated with water and extracted with EA (500 mL×3). The combined organic layers were washed with brine, dried over Na2SO4, and then concentrated in vacuo. Purification by column chromatography over silica gel eluted with PE afforded the product as colorless oil (43 g, yield 68%). 1H NMR (300 MHz, CDCl3): δ 7.69 (m, 1H), 7.47 (d, J=8.1 Hz, 1H), 7.00 (m, 1H), 2.26 (s, 3H) ppm.

1. temperaturewas refluxed for 1.5 h
2. additionTo this mixture was added mixture A, and the solution
3. temperaturewas then refluxed for 3 h
4. extractionextracted with EA (500 mL×3)
5. washThe combined organic layers were washed with brine
6. dry with materialdried over Na2SO4
7. concentrationconcentrated in vacuo
8. customPurification by column chromatography over silica gel
9. washeluted with PE

ORD-Eintrag

ord-e2e8792fee26474b83fb3560bfdcff3a

Quelldatensatz

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08853186B2