Methylamine → 2-(2-(4-(1-(methylamino)ethyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide

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Reaction Steps

To MeOH (1.5 mL) was added 2M methylamine in THF (0.724 mL, 1.448 mmol). Acetic acid was added to the mixture to adjust the pH to 4-5. 2-(2-(4-acetyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (50 mg, 0.121 mmol) and sodium cyanoborohyde (7.58 mg, 0.121 mmol) were added before heating the reaction to 100° C. for 30 min by microwave irradiation. The reaction mixture was quenched with water before purification by preparative reverse phase HPLC. The product fractions were acidified to pH 3 with acetic acid before applying to a strong cation exchange cartridge (500 mg). The cartridge was washed with DCM/MeOH (1:1) before eluting the product with 2M NH3 in MeOH. The solvent was removed in vacuo to give the title compound (7.1 mg, 0.017 mmol, 14%).

Provenance & Evidence