Water → 2,4-dimethyl-1-{[2-methyl-3-(trifluoromethyl)phenyl]methyl}-6-(4-morpholinyl)-1H-benzimidazole

Participants

Reaction Steps

A mixture of 4-bromo-2-methyl-1-{[2-methyl-3-(trifluoromethyl)phenyl]methyl}-6-(4-morpholinyl)-1H-benzimidazole, prepared as described in Example 62 (200 mg, 0.427 mmol), trimethylboroxine (0.239 mL, 1.708 mmol), Pd(Ph3P)4 (49.4 mg, 0.043 mmol) and potassium carbonate (118 mg, 0.854 mmol) in 1,4-Dioxane (2.5 mL)/Water (0.25 mL) was irradiated at 120° C. in a microwave synthesizer for 40 min, then cooled and poured into water. The mixture was extracted with ethyl acetate. The extracts were washed with brine, dried (Na2SO4) and evaporated under reduced pressure. The residue was purified by RP-HPLC (25-45% AcCN in water plus 0.1% TFA) to give the desired compound (77 mg, 0.181 mmol, 42.5% yield) as a white solid (contains 3-5% of the 4-H compound). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.58 (d, J=8.08 Hz, 1 H), 7.12 (t, J=7.83 Hz, 1 H), 6.80 (d, J=1.01 Hz, 1 H), 6.51 (d, J=7.83 Hz, 1 H), 6.40 (d, J=1.77 Hz, 1 H), 5.26 (s, 2 H), 3.78-3.91 (m, 4 H), 3.01-3.15 (m, 4 H), 2.67 (s, 3 H), 2.56 (s, 3 H), 2.50 (s, 3 H). MS(ES+) m/e 404.1 [M+H]+. (NOTE: The reaction was repeated using PdCl2(dppf) as catalyst. Less (to negligible) reduction was observed).

Provenance & Evidence