Trifluoroacetic acid → HCID 59471633, compound

Participants

Reaction Steps

Sodium carbonate (335.4 μL of 2 M, 0.6708 mmol) was added to a solution of tert-butyl N-[[3-[5-(3-amino-6-bromo-pyrazin-2-yl)-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate (100 mg, 0.2236 mmol), (4-isopropylsulfonylphenyl)boronic acid (66.30 mg, 0.2907 mmol), palladium; triphenylphosphane (25.84 mg, 0.02236 mmol) in dioxane (5 mL) and the resulting mixture heated at 110° C. under microwave conditions for 90 min. The mixture was placed directly onto silica gel pad and washed through with diethyl ether and followed by 50% EtOAc/ petroleum ether. Product fractions were combined and concentrated in vacuo. The residue was dissolved in CH2Cl2 (10 mL) and TFA (764.9 mg, 516.8 μL, 6.708 mmol) was added. The reaction mixture was stirred at room temperature for 1 h and then concentrated in vacuo to leave an oil. This was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lypholised to give the product as a yellow solid (36.05 mg, 35% yield); 1H NMR (400 MHz, DMSO) d 1.3 (d, 6H), 3.45-3.55 (m, 1H), 4.24-4.3 (m, 2H), 7.7-7.8 (m, 2H), 7.95 (d, 2H), 8.25 (d, 1H), 8.3-8.4 (br s, 2H), 8.4 (s, 1H), 8.45 (d, 2H) and 9.1 (s, 1H) ppm; MS (ES+) 451.2

Provenance & Evidence