N,N-dimethyl-5-nitropyridin-2-amine → N2,N2-dimethylpyridine-2,5-diamine

Participants

Reaction Steps

To a solution of 2-dimethylamino-5-nitropyridine (334 mg, 2 mmol) in 100 ml of methanol was added 5% Pd/C (100 mg, 0.94 mmol). The reaction mixture was hydrogenated under 45 psi at room temperature for 2 h, then it was filtered through a layer of celite (2.5 in d×2 in h) and washed with additional methanol (25 ml). The organic filtrate was concentrated to yield 200 mg (73%) of 2-dimethylamino-5-amino-pyridine as dark brown sticky solids. The title compound was prepared from 4-chloro-2-methyl-quinazoline (182.2 mg, 1.02 mmol), 2-dimethylamino-5-amino-pyridine (140 mg, 1.02 mmol) and sodium acetate (98.4 mg, 1.2 mmol) similar to example 20 to give 60 mg (21%) of paint yellow solids. 1H NMR (CDCl3): 8.43 (d, J=2.4 Hz, 1H), 7.95 (dd, J=2.7 Hz, J=9.3 Hz, 1H), 7.84-7.72 (m, 3H), 7.47 (t, J=8.1 Hz, 1H), 7.16 (brs, 1H), 6.61 (d, J=9.0 Hz, 1H), 3.12 (s, 6H), 2.65 (s, 3H).

Provenance & Evidence