Stannous chloride dihydrate → 3-isopropyl-1-(1-methyl-1H-benzo[d]imidazol-5-yl)-1H-pyrazol-5-amine

Participants

Reaction Steps

Using a procedure analogous to Example B22, 1-methyl-1H-benzo[d]imidazol-5-amine (0.50 g, 3.4 mmol), NaNO2 (0.28 g, 4.1 mmol), SnCl2.2H2O (2.8 g, 14 mmol) and 4-methyl-3-oxopentanenitrile (0.45 g, 4.1 mmol) were combined to afford crude 3-isopropyl-1-(1-methyl-1H-benzo[d]imidazol-5-yl)-1H-pyrazol-5-amine (0.63 g, 73% yield) as a foam which was used as is in the next reaction. 1H NMR (400 MHz, DMSO-d6): δ 8.22 (s, 1H), 7.72 (dd, J=0.40 and 1.2 Hz, 1H), 7.60 (dd, J=0.40 and 8.4 Hz, 1H), 7.42 (dd, J=2.0 and 8.4 Hz, 1H), 5.32 (s, 1H), 5.08 (brs, 2H), 3.85 (s, 3H), 2.75 (septet, J=6.8 Hz, 1H), 1.16 (d, J=6.8 Hz, 6H); MS (ESI) m/z: 250.0 (M+H+).

Provenance & Evidence