Benzimidazole → 1H-Benzo[D]imidazole-2-YL(4-(3-(tetrahydro-2H-thiopyran-4-YL)pyrazin-2-yloxy)phenyl)methanone

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A mixture of 1H-benzo[d]imidazole (0.039 g, 0.334 mmol), triisopropoxymethane (0.529 g, 2.78 mmol), benzenesulfonic acid (2.200 mg, 0.014 mmol) in toluene (5 mL) was heated at reflux for 3 h. The mixture was cooled, neutralized with diisopropylamine (0.1 ml), concentrated to dryness and diluted with 1 ml THF. The above solution was added to a stirred mixture of N-methoxy-N-methyl-4-(3-(tetrahydro-2H-thiopyran-4-yl)pyrazin-2-yloxy)benzamide (0.100 g, 0.278 mmol) in THF (3 mL). The resulting mixture was cooled to 0° C. and LDA (0.167 mL, 0.334 mmol) was added dropwise. The reaction mixture was stirred at RT overnight, quenched with saturated NH4Cl, extracted with EtOAc (3×), dried over MgSO4, concentrated and purified by ISCO (0-5% MeOH/DCM) to give the title compound as a white solid. MS (ESI, pos. ion) m/z: 416.1 (M+1). IC50 (uM) +++++.

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