Hydrochloric Acid → 6-Amino-4-[3-chloro-4-(2-pyridylmethoxy)anilino]quinazoline

Participants

Reaction Steps

N-[3-Chloro-4-(2-pyridylmethoxy)phenyl]-6-nitro-quinazolin-4-amine 4d (4.07 g, 10 mmol) and concentrated hydrochloric acid (2 mL, 24 mmol) were dissolved in 130 mL of the solvent mixture of 95% ethanol and water (V/V=10/3), followed by addition of iron powder (11.17 g, 200 mmol). The reaction mixture was heated to reflux for 2 hours, filtered while hot and the filtrate was concentrated under reduced pressure to remove ethanol. The resulting residue was adjusted to pH>7 with ammonium hydroxide, filtered and the filter cake was dried under vacuum, purified by silica gel column chromatography with elution system A to obtain the title compound N4-[3-chloro-4-(2-pyridylmethoxy)phenyl]quinazoline-4,6-diamine 4e (2.04 g, yield 54.1%) as a white solid.

Provenance & Evidence