Hydrochloric Acid → 2-Amino-6-chlorophenol

A solution of 2-chloro-6-nitrophenol (1.210 g, 6.972 mmol) in ethanol (50 mL) was treated with iron powder (1.947 g, 34.86 mmol) and concentrated HCl (3 mL). The yellow mixture was heated to reflux for 18 h and then cooled to room temperature. The reaction mixture was filtered through a pad of Celite, and the filtrate was neutralized with satd aq NaHCO3 solution. The resulting gray suspension was filtered through a pad of Celite, and the filtrate was extracted with ethyl acetate (3×20 mL). The combined organic layers were washed with brine, dried over anhydrous magnesium sulfate, filtered, and concentrated to give a black solid. Trituration with heptane afforded 2-amino-6-chlorophenol (0.577 g, 58%) as a dark brown solid. RP-HPLC (25 to 100% CH3CN in 0.1 N aqueous ammonium acetate over 10 min at 1 mL/min using a Hypersil HS C18, 100 Å, 5 μm, 250×4.6 mm column) tr=7.30 min., 91%; m/z 143 (MH+).

1. temperatureThe yellow mixture was heated
2. temperatureto reflux for 18 h
3. filtrationThe reaction mixture was filtered through a pad of Celite
4. filtrationThe resulting gray suspension was filtered through a pad of Celite
5. extractionthe filtrate was extracted with ethyl acetate (3×20 mL)
6. washThe combined organic layers were washed with brine
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customto give a black solid

ORD record

ord-5752579c992c4d2db51f1e5726bd730a

Source dataset

uspto-grants-2005_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06921763B2