Thiophosgene → 2-(4-Isothiocyanatophenoxy)-3-(2-methylpyridin-4-yl)pyridine

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Reaction Steps

To a 15 mL round bottomed flask was added 4-(3-(2-methylpyridin-4-yl)pyridin-2-yloxy)benzenamine (0.0978 g, 0.35 mmol) and sodium carbonate (0.0823 g, 0.78 mmol) in chloroform. Thiophosgene (0.030 mL, 0.39 mmol) was slowly added and allowed to stir overnight. The solution was filtered and concentrated to give 2-(4-isothiocyanatophenoxy)-3-(2-methylpyridin-4-yl)pyridine. To the flask was then added 1,2-phenylenediamine (0.0470 g, 0.410 mmol), and N,N′-dicyclohexylcarbodiimide (0.1032 g, 0.5200 mmol) in tetrahydrofuran at 75° C. to stir overnight. Upon completion, the solvent was evaporated. The crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage™ pre-packed silica gel column (25M), eluting with a gradient of 1% to 5% methanol in DCM, to provide N-(4-(3-(2-methylpyridin-4-yl)pyridin-2-yloxy)phenyl)-1H-benzo[d]imidazol-2-amine. MS (ESI, pos. ion) m/z: 394.1 (M+1). IC50 (uM) +++++.

Provenance & Evidence