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

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-fluoroethanamine (107 mg, 1.689 mmol) in MeOH (1.5 mL), AcOH was added until the pH reached 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) was added before the addition of sodium cyanoborohydride (7.58 mg, 0.121 mmol). The reaction was heated by microwave irradiation to 100° C. for 20 min. The reaction mixture was filtered before purification by preparative reverse phase HPLC. The product fractions were acidified to pH 4 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 (2.9 mg, 0.006 mmol, 5%).

Provenance & Evidence