Hydrochloric Acid → HCID 178502481, compound

Participants

Reaction Steps

To a solution of (1R,3S,5R)-tert-butyl 3-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-naphtho[1,2-d]imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate (0.60 g, 1.3 mmol) in a mixture of CH2Cl2 (12.0 mL) and MeOH (2.5 mL) was added HCl (4M in 1,4-dioxane, 9.4 mL, 37.6 mmol). The solution was stirred at room temperature for 2.5 h and concentrated to dryness. The crude intermediate was suspended in CH2Cl2 (12 mL). (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid (0.25 g, 1.4 mmol), HATU (0.58 g, 1.5 mmol), and DIPEA (0.7 mL, 4.0 mmol) were sequentially added to the reaction. The homogenous solution was then stirred at room temperature for 1.5 h. The solution was diluted with CH2Cl2 and washed with HCl (aqueous, 1N) and aqueous bicarbonate (sat.). The aqueous layers were back extracted with CH2Cl2 and the combined organic layers were dried over Na2SO4 and concentrated. The crude oil was then purified by silica gel chromatography (30 to 100% EtOAc (5% MeOH)/Hexanes) to provide methyl (S)-3-methyl-1-oxo-1-((1R,3S,5R)-3-(7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-naphtho[1,2-d]imidazol-2-yl)-2-azabicyclo[3.1.0]hexan-2-yl)butan-2-ylcarbamate (0.60 g, 89%). LCMS-ESI+: calc'd for C29H37BN4O5: 532.29 (M+); Found: 533.11 (M+H+).

Provenance & Evidence