[N+]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[C:10]#[N:11])([O-])=O.[CH2:12]([SH:19])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.[OH-].[K+]>CN(C)C=O>[CH2:12]([S:19][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[C:10]#[N:11])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1A mixture consisting 2-nitrobenzenenitrile (5.0 g, 33.75 mmol) in 30 mL of anhydrous dimethylformamide (DMF) was cooled in an ice water bath (0° C.) and placed under N2 atmosphere. Benzylmercaptan (4.0 mL, 33.75 mmol) was added followed by the dropwise addition of an aqueous potassium hydroxide solution (3.40 g, 60.75 mmol in 10 mL of water). The reaction mixture was stirred at 0° C. for thirty minutes then allowed to warm to room temperature. After four hours the reaction appeared complete by thin layer chromatography (TLC). To the reaction mixture ice water (100 mL) was added. The solution was extracted with dichloromethane (200 mL) and washed with brine (100 mL). The organic layer was dried over sodium sulfate (Na2SO4) and then concentrated under reduced pressure to afford a red oil. The product was purified by flash silica column chromatography. Elution through an 80-g Silicycle® flash silica cartridge with 5% ethyl acetate in heptanes afforded the title compound as a bright yellow solid (6.08 g, 80%) Rf of 0.24″ with 95:5 v/v heptanes: ethyl acetate; 1H-NMR (400 MHz; CDCl3) δ 7.62 (dd, 1H), 7.47-7.42 (dt, 1H), 7.38 (dd, 1H), 7.32-7.25 (m, 6H); MS (ESI−) m/z 224.1 (Mz−1).
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