Acetonitrile → 3-[5-[4-(Aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine

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A solution of tert-butyl N-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate (45 mg, 0.08172 mmol) in CH2Cl2 (1 mL) was treated with TFA (1 mL, 12.98 mmol) and stirred at room temperature for 1 h. The solution was concentrated under reduced pressure then azeotroped with methanol/ CH2Cl2 (×2), dissolved in CH2Cl2/MeOH and passed through a carbonate cartridge. The eluent was concentrated then crystallised from hot acetonitrile giving a yellow crystalline solid (18 mg, 41% yield); 1H NMR (400 MHz, DMSO) d 1.20 (d, 6H), 1.97 (br s, 2H), 3.47 (m, 1H), 3.85 (s, 2H), 7.63 (d, 2H), 7.89 (br s, 2H), 7.98 (d, 2H), 8.11 (d, 2H), 8.40 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES+) 451.41

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