Hydrochloric Acid → HCID 178502473, compound

Participants

Reaction Steps

Hydrogen chloride in dioxane solution (4N, 6.78 mL, 27.18 mmol) was added to (1S,3S,4R)-tert-butyl 3-(7-bromo-1H-naphtho[1,2-d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptane-2-carboxylate (0.80 g, 1.81 mmol) in methylene chloride:methanol (18.1 mL: 3.6 mL). The suspension was allowed to stir at room temperature for one hour. Upon completion by LCMS, the reaction was concentrated to dryness and the crude product (assumed 1.81 mmol) was suspended in methylene chloride (18 mL). (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid (0.38 g, 2.17 mmol) and DIPEA (1.58 mL, 9.04 mmol) were added to the slurry. HATU (1.03 g, 2.71 mmol) was added and the reaction was stirred at room temperature for 3 hours. Upon completion, the crude reaction was diluted in methylene chloride and washed with 1N HCl, and aqueous sodium bicarbonate. The organic layer was concentrated and purified by normal phase chromatography (40-80% ethyl acetate (5% methanol) in hexanes) to give methyl (S)-1-((1S,3S,4R)-3-(7-bromo-1H-naphtho[1,2-d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptan-2-yl)-3-methyl-1-oxobutan-2-ylcarbamate (0.949, >99%).

Provenance & Evidence