Hydrochloric Acid → Benzenamine, 4-methoxy-3-nitro-

Temperatur

0 °C

To a 1M solution of 3-nitro-4-fluoroaniline (16.7 g, 107 mmol, from Aldrich Chemical Co., Milwaukee, Wis., U.S.A.) in anhydrous methanol at ambient temperature was added sodium methoxide (23.1 g, 428 mmol) and the resulting solution was refluxed with stirring for 21 hours. The reaction mixture was then cooled to 0° C. and a 12M solution of HCl (13.4 mL) was added dropwise followed by water (250 mL). The crude mixture was extracted three times with Et2O (200 mL). The organic layers were combined, washed with brine (300 mL), dried over Na2SO4, and concentrated under vacuum to yield 17.5 g (97%) of product as a dark brown solid, which was used without further purification. 1H NMR (400 MHz, DMSO-d6) δ7.09 (d, J=9 Hz, 1H), 7.01 (dd, J=2.8, 1.3 Hz, 1H), 6.85 (ddd, J=9, 2.8, 1.4 Hz, 1H), 5.2 (s, 2H), 3.75 (s, 3H).

1. temperaturethe resulting solution was refluxed
2. extractionThe crude mixture was extracted three times with Et2O (200 mL)
3. washwashed with brine (300 mL)
4. dry with materialdried over Na2SO4
5. concentrationconcentrated under vacuum

ORD-Eintrag

ord-40ea88c7ad054161aa8a7a2c3c4d9eab

Quelldatensatz

uspto-grants-2001_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06214880B1