Cesium carbonate → Tert-butyl 4-[(6-bromo-2-{[1-({[tert-butyl(dimethyl)silyl]oxy}methyl)cyclopropyl]methyl}-1-oxo-1,2-dihydroisoquinolin-4-yl)sulfonyl]-1,4-diazepane-1-carboxylate

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Reaction Steps

tert-Butyl 4-[(6-bromo-1-oxo-1,2-dihydroisoquinolin-4-yl)sulfonyl]-1,4-diazepane-1-carboxylate (Example 46b, 0.40 g), [1-({[tert-butyl(dimethyl)silyl]oxy}methyl)cyclopropyl]methyl methanesulfonate (0.24 g) and cesium carbonate (0.536 g) were stirred together in DMF (20 mL) at 110° C. for 72 h under nitrogen, cooled to room temperature, diluted with water (100 mL) and extracted into ethyl acetate (3×20 mL). The combined organics were washed with saturated brine (3×20 mL), dried (MgSO4) filtered and evaporated, and the residue was purified (SiO2 chromatography, elution with 10% ethyl acetate in DCM) to give (tert-butyl 4-[(6-bromo-2-{[1-({[tert-butyl(dimethyl)silyl]oxy}methyl)cyclopropyl]methyl}-1-oxo-1,2-dihydroisoquinolin-4-yl)sulfonyl]-1,4-diazepane-1-carboxylate) as a solid. This was dissolved in DMF (10 mL), treated with N-cyclopropyl-3-fluoro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzamide (0.089 g), potassium carbonate (0.077 g) and Pd-118 (0.006 g) and the resulting mixture was stirred at 70° C. under nitrogen for 1 h. After being cooled to room temperature, it was diluted with saturated brine and extracted into ethyl acetate (3×30 mL). The combined extracts were washed with brine (3×30 mL), dried (MgSO4) filtered and evaporated. The residue was dissolved in THF (20 mL), treated with 4 M HCl in dioxane (3 mL), stirred at room temperature for 3 h, evaporated and purified by preparative HPLC (Waters Xbridge column using a 95-5% gradient of aqueous 0.2% ammonia in acetonitrile as eluent) to give the title compound (0.019 g) as a solid.

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