Lithium diisopropylamide → 4-[1-(2-aminopyrimidin-4-yl)-3-methyl-1H-indazol-6-yl]-2-(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-imidazol-2-yl)but-3-yn-2-ol

Participants

Reaction Steps

To a solution of 1-(2-aminopyrimidin-4-yl)-6-ethynyl-N,N-dimethylindazole-3-carboxamide (200 mg, 0.8 mmol) in THF (2 mL) at −78° C. under nitrogen was added 2M LDA in THF (1.40 mL, 2.81 mmol). After 1 hour, 1-(1-{[2-(trimethylsilyl)ethoxy]methyl}imidazol-2-yl)ethanone (771.45 mg, 3.21 mmol) in THF (1.0 mL) was added. After stirring for 15 minutes, the reaction mixture was allowed to warm to RT and stirred for 2 hr. The reaction mixture was quenched by addition of saturated aqueous ammonium chloride (3 mL) and the volatiles were removed in vacuo. The reaction mixture was diluted with DCM (10 ml) and washed with water (2 mL), dried (Na2SO4), filtered and concentrated in vacuo. The crude product was purified by flash chromatography (Biotage, 1-12% methanol gradient in DCM) to surrender the title compound as a yellow solid: 1H NMR (500 MHz, DMSO) delta −0.19 (9H, s), 0.83-0.77 (2H, m), 2.01 (3H, s), 2.57 (3H, s), 3.59-3.49 (2H, m), 5.62 (1H, d, J=10.3 Hz), 5.78 (1H, d, J=10.2 Hz), 6.42 (1H, s), 6.86 (1H, d, J=1.1 Hz), 6.96 (2H, s), 7.03 (1 H, d, J=5.5 Hz), 7.27 (1H, d, J=1.0 Hz), 7.36 (1H, dd, J=8.1, 1.1 Hz), 7.84 (1H, d, J=8.2 Hz), 8.25 (1H, d, J=5.5 Hz), 8.85 (1H, s); LC-MS: m/z=+490.10 (M+H)+

Provenance & Evidence