Cesium carbonate → N-Cyclopropyl-3-fluoro-5-(2-{[1-(hydroxymethyl)cyclopropyl]methyl}-4-{[(3S)-3-methylpiperazin-1-yl]methyl}-1-oxo-1,2-dihydroisoquinolin-6-yl)-4-methylbenzamide

Participants

Reaction Conditions

Reaction Steps

A solution of tert-butyl (2S)-4-[(6-bromo-1-oxo-1,2-dihydroisoquinolin-4-yl)methyl]-2-methylpiperazine-1-carboxylate (Example 34b, 0.26 g) dissolved in DMF (5 mL) was treated with [1-({[tert-butyl(dimethyl)silyl]oxy}methyl)cyclopropyl]methyl methanesulfonate (example 34d, 0.351 g) and cesium carbonate (0.582 g) under nitrogen. The resulting mixture was stirred at 75° C. for 3 h. The mixture was treated with N-cyclopropyl-3-fluoro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzamide (0.266 g) and Pd-118 (0.019 g) before heating at 80° C. for 1 h. The reaction mixture was diluted with water (250 mL), and extracted with ethyl acetate (250 mL). The organic was dried (MgSO4), filtered and evaporated. The crude product was purified (SiO2 chromatography, elution 100% ethyl acetate). Pure fractions of [tert-butyl (2S)-4-[(6-[5-(cyclopropylcarbamoyl)-3-fluoro-2-methylphenyl]-2-{[1-(hydroxymethyl)cyclopropyl]methyl}-1-oxo-1,2-dihydroisoquinolin-4-yl)methyl]-2-methylpiperazine-1-carboxylate] were evaporated to dryness. The mixture was treated with trifluoroacetic acid/DCM (1:1, 10 mL) and stirred for 1 h at room temperature. The mixture was evaporated to dryness and the crude material was dissolved in acetonitrile (25 mL) and loaded on to a 10 g SCX cartridge. The impurities were washed through with acetonitrile (50 mL) and discarded. The product was eluted with 1 N methanolic ammonia (100 mL) and evaporated in vacuo. The product was purified by preparative HPLC (XBridge column using a 95-40% gradient of aqueous 0.1% ammonia in acetonitrile as eluent). The fractions were evaporated to afford the title compound (0.050 g).

Provenance & Evidence