Hydrochloric Acid → 1-(3-((2-(((1R,2R)-2-hydroxycyclohexyl)amino)benzo[d]thiazol-6-yl)methyl)-3H-imidazo[4,5-b]pyridin-5-yl)ethanone

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of (1R,2R)-2-((6-((5-bromo-3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanol (100 mg, 0.218 mmol) from Example 78, tributyl(1-ethoxyvinyl)tin (157 mg, 0.436 mmol) in anhydrous DMF (2 mL) at rt was purged for 15 min with a stream of argon. To the resulting mixture was added tetrakis(triphenylphosphine) palladium (0) (38 mg, 0.0327 mmol). The reaction vessel was sealed and the mixture was stirred at 110° C. for 2 h. After cooling to rt, 2 M aq HCl (0.5 mL) was added, and the mixture was stirred at rt for 1.5 h. The mixture was purified directly by reverse-phase HPLC using a mixture of water (5% CH3CN, 0.05% HOAc) and CH3CN (0.05% HOAc) as the mobile phase and Varian Pursuit XRs diphenyl column as the stationary phase to afford crude 1-(3-((2-(((1R,2R)-2-hydroxycyclohexyl)amino)benzo[d]thiazol-6-yl)methyl)-3H-imidazo[4,5-b]pyridin-5-yl)ethanone. The crude product was triturated with Et2O and the solid was collected by filtration and dried to afford 1-(3-((2-(((1R,2R)-2-hydroxycyclohexyl)amino)benzo[d]thiazol-6-yl)methyl)-3H-imidazo[4,5-b]pyridin-5-yl)ethanone (19 mg, 21%) as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 8.84 (s, 1H), 8.22 (d, J=8.5 Hz, 1H), 8.00 (d, J=7.5 Hz, 1H), 7.92 (d, J=8.3 Hz, 1H), 7.80 (s, 1H), 7.26-7.39 (m, 2H), 5.55 (s, 2H), 4.77 (d, J=4.9 Hz, 1H), 3.50 (m, 1H), 3.30 (m, 1H), 2.74 (s, 3H), 2.02 (m, 1H), 1.87 (m, 1H), 1.55-1.67 (m, 2H), 1.12-1.32 (m, 4H). LCMS (ESI) m/z 422 (M+H)+.

Provenance & Evidence