Hydrochloric Acid → N-((1S)-2-(D-Alanylamino)-1-{[4-(8-bromoimidazo[1,2-a]pyridin-2-yl)phenyl]methyl}ethyl)-3-chloro-4-[(1-methylethyl)oxy]benzamide

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A solution of N-((1S)-2-amino-1-{[4-(8-bromoimidazo[1,2-a]pyridin-2-yl)phenyl]methyl}ethyl)-3-chloro-4-[(1-methylethyl)oxy]benzamide (0.28 mmol), N-{[(1,1-dimethylethyl)oxy]carbonyl}-D-alanine (0.56 mmol), EDCI (0.56 mmol), and TEA (1.12 mmol) stirred in methylene chloride (2 mL) at RT for 18 h. The reaction was then treated with 4 M HCl in 1,4-dioxane (2 mL) and stirred at RT for 1 h. The mixture was then concentrated in vacuo, redissolved in ethyl acetate (25 mL) and washed with saturated aqueous sodium bicarbonate solution (1×10 mL). The organic layer was concentrated in vacuo, and purification of the residue by Gilson reverse phase HPLC afforded the title product as a white solid (25%). ESMS [M+H]+: 613.2.

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