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

Participants

Reaction Steps

To a solution of 4-(6-ethynyl-3-methylindazol-1-yl)pyrimidin-2-amine (150 mg, 0.6 mmol) in THF (2 mL) at −78° C. under nitrogen was added 2M LDA in THF (0.75 mL, 1.50 mmol). After 5 minutes, 1-(1-methyl-1H-imidazol-2-yl)ethanone (225 mg, 1.81 mmol) in THF (1.0 mL) was added, and after a further 20 minutes the mixture was allowed to warm to RT and stirred for 1.5 hours. The reaction mixture was then cooled to −78° C. and treated with additional 2M LDA in THF (0.3 mL, 0.6 mmol) and 1-(1-methyl-1H-imidazol-2-yl)ethanone (90 mg, 0.6 mmol). After stirring at RT for 4 hr, the reaction mixture was quenched by addition of saturated aqueous NH4Cl (2 mL). The volatiles were removed in vacuo and the 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, 3-12% methanol gradient in DCM) to give the title compound: 1H NMR (500 MHz, DMSO) delta 2.00 (3H, s), 2.57 (3H, s), 3.92 (3H, s), 6.32 (1H, s), 6.77 (1H, s), 6.98 (2 H, s), 7.03 (1H, d, J=5.5 Hz), 7.15 (1H, s), 7.36 (1H, d, J=8.2), 7.84 (1H, d, J=8.2 Hz), 8.25 (1H, d, J=5.5 Hz), 8.84 (1H, s); LC-MS: m/z=+374.05 (M+H)+.

Provenance & Evidence