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5-(2-isopropylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (50 mg, 0.1284 mmol) was dissolved in dichloromethane (10 mL) and cooled to 0° C. in an ice-bath. 3-Chlorobenzenecarboperoxoic acid (26.59 mg, 0.1541 mmol) was added in one portion with rapid stirring. The mixture was stirred at 0° C. for 15 min, washed with saturated aqueous NaHCO3 solution (1×5 mL) and brine (1×5 mL), dried over MgSO4 and concentrated in vacuo to leave a solid which was purified by column chromatography on silica eluting with ether/ petroleum ether to yield the product as a yellow solid (16.1 mg, 31% yield); 1H NMR (400.0 MHz, CDCl3) d 1.2 (d, 3H), 1.35 (d, 3H), 3.5-3.6 (m, 1H), 7.5-7.75 (m, 2H), 7.5-7.65 (m, 7H), 8.25 (d, 2H) and 8.55 (s, 1H) ppm; MS (ES+) 406.1

1. washwashed with saturated aqueous NaHCO3 solution (1×5 mL) and brine (1×5 mL)
2. dry with materialdried over MgSO4
3. concentrationconcentrated in vacuo
4. customto leave a solid which
5. customwas purified by column chromatography on silica eluting with ether/ petroleum ether