Potassium Carbonate → methyl 6-(4-morpholinyl)-1-(1-naphthalenylmethyl)-2-(trifluoromethyl)-1H-benzimidazole-4-carboxylate

関与物質

反応手順

A mixture of methyl 5-(4-morpholinyl)-2-(trifluoromethyl)-1H-benzimidazole-7-carboxylate prepared as described in Example 45 (1.5 g, 4.56 mmol) and potassium carbonate (1.889 g, 13.67 mmol) in N,N-Dimethylformamide (DMF) (10 mL) was stirred at rt for 10 min. After addition of 1-(bromomethyl)naphthalene (1.511 g, 6.83 mmol), the mixture was warmed to 80° C. and stirred for 3 h at this temperature. The resulting mixture was cooled to rt and poured over ice. The precipitate formed was collected by filtration and air dried (2.4 g total). The crude material was purified on silica gel (ISCO, 0-5% MeOH in DCM) to give methyl 6-(4-morpholinyl)-1-(1-naphthalenylmethyl)-2-(trifluoromethyl)-1H-benzimidazole-4-carboxylate (1.48 g, 3.15 mmol, 69.2% yield). A portion of this material (138 mg) was purified by reverse phase-HPLC (25 to 95% AcCN in water, plus 0.1% TFA) to give the desired product (93.4 mg, 0.195 mmol, 4.28% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.26 (d, J=8.34 Hz, 1H), 8.01 (d, J=7.33 Hz, 1H), 7.85 (d, J=8.08 Hz, 1H), 7.60-7.73 (m, 3H), 7.39 (d, J=2.27 Hz, 1H), 7.31 (t, J=7.83 Hz, 1H), 6.24 (br. s., 1H), 6.22 (s, 2H), 3.95 (s, 3H), 3.64-3.73 (m, 4H), 3.06-3.19 (m, 4H). MS (ES+) m/e 470 [M+H]+.

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