Stannous chloride dihydrate → 3-(2-isopropyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-isopropyl-5-(2-methoxy-5-nitro-phenyl)-1H-pyrazole, from Example 1.81, Step C (0.57 g, 2.18 mmol) in ethanol (5.0 mL), was added SnCl2.2H2O (1.97 g, 8.74 mmol) and the mixture was heated at 55° C. overnight. The ethanol was evaporated and the residue was taken in ethyl acetate (50 mL) and washed with 10% NaOH (10 mL). The organic layer was dried over MgSO4 and evaporated to yield a light yellow solid. The crude material was purified via Biotage silica chromatography (hexane/EtOAc, 3/1) to yield a pale yellow solid of 3-(2-isopropyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine (0.465 g, 94%). LCMS m/z (%)=232 M+H+ (100), 1H NMR (400 MHz, CDCl3) δ: 7.47 (s, 1H), 6.78 (d, J=8.08 Hz, 1H), 6.72 (dd, J1=8.01 Hz, J2=2.78 Hz, 1H), 6.54 (d, J=2.78 Hz, 1H), 6.25 (s, 1H), 4.14 (m, 1H), 3.63 (s, 3H), 1.4 (d, J=6.57 Hz, 3H), 1.23 (d, J=6.57 Hz, 3H).

Provenance & Evidence