Potassium Carbonate → 3-[3-(1,4-Dimethyl-1H-indol-3-ylmethyl)-5,6-dimethyl-2-oxo-2,3-dihydro-benzimidazol-1-yl]-hexanoic acid ethyl ester

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A mixture of 1-(1,4-Dimethyl-1H-indol-3-ylmethyl)-5,6-dimethyl-1,3-dihydro-benzimidazol-2-one (0.1 g, 0.31 mmol), K2CO3 (87 mg, 0.63 mmol) and ethyl trans-2-hexenoate (0.45 g, 3.1 mmol) was heated to 130° C. for 20 min in a microwave. Since the starting material was not soluble in ethyl trans-2-hexenoate even after heating, DMA (2 mL) was added to the reaction mixture and heated again at 150° C. for 30 min. Although the un-reacted starting material was present, the reaction mixture was diluted with ethyl acetate and washed with water (×4). The organic phase was dried over Na2SO4 and concentrated. The resulting heterogeneous residue was purified by silica gel prep TLC using 4:1 hexanes:ethyl acetate as an eluent to afford 25 mg of the desired product as an oil. LCMS (ESMS): m/z 462.88 (M+H+).

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