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

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of (1R,2R)-2-((6-((6-bromo-3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazol-2-yl)amino)cyclohexanol (50 mg, 0.109 mmol) from Example 29, tributyl(1-ethoxyvinyl)tin (79 mg, 0.218 mmol) and TEA (22 mg, 0.218 mmol) in anhydrous DMF (1 mL) at rt was flushed with a stream of argon for 15 min. To the resulting mixture was added tetrakis(triphenylphosphine)palladium (0) (19 mg, 0.0165 mmol). The reaction vessel was sealed and the mixture was heated with stirring at 110° C. for 1.5 h. After cooling to rt, aq 2 M HCl (500 μL) was added and the mixture was stirred for 1 h. The reaction mixture was purified directly by reverse-phase HPLC using a mixture of water (5% CH3CN, 0.05% HCOOH) and CH3CN (0.05% HCOOH) as the mobile phase and Varian Pursuit XRs C18 column as the stationary phase to afford 1-(3-((2-(((1R,2R)-2-hydroxycyclohexyl)amino)benzo[d]thiazol-6-yl)methyl)-3H-imidazo[4,5-b]pyridin-6-yl)ethanone (8 mg, 17%) as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 9.00 (d, J=1.5 Hz, 1H), 8.76 (s, 1H), 8.64 (s, 1H), 7.99 (d, J=7.5 Hz, 1H), 7.68 (s, 1H), 7.20-7.32 (m, 2H), 5.53 (s, 2H), 4.76 (br s, 1H), 3.50 (m, 1H), 3.30 (m, 1H), 2.68 (s, 3H), 2.04 (m, 1H), 1.87 (m, 1H), 1.55-1.65 (m, 2H), 1.10-1.30 (m, 4H). LCMS (ESI) m/z 422 (M+H)+.

Provenance & Evidence