Sodium Chloride → Baxdrostat Impurity 30

Participants

Reaction Conditions

Reaction Steps

In a 100 mL round-bottomed flask, (rac)-4-bromo-5,6,7,8-tetrahydroisoquinolin-8-amine (745 mg, 3.28 mmol) and 1-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydroquinolin-2(1H)-one (intermediate A-1) (1.13 g, 3.94 mmol) were dissolved in ethanol (60 mL) to give a light brown solution. Na2CO3 (382 mg, 3.61 mmol), dissolved in water (10 mL) was added followed by tetrakis(triphenylphosphine)palladium (0) (114 mg, 98.4 μmol) after evacuation and replacing 5 times with Argon. The solution was then heated at 85° C. overnight. The reaction was treated with an aq. 10% NaCl solution and extracted with AcOEt (3×). The organic phases were washed again with an aq. 10% NaCl solution, dried over Na2SO4, filtered and evaporated under reduced pressure to give 1.39 g brown foam which was purified by flash chromatography (50 g SiO2, Telos-cartridge, CH2Cl2/MeOH (3, 5, 7.5, 10 and 15%)) and precipitated from CH2Cl2 with n-pentane to give the title compound (690 mg, 68%) as a light brown foam. MS: 308.2 (M+H+).

Provenance & Evidence