Methanol → HCID 178499252, 화합물

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To a mixture of 5-bromo-3-(2,2-dimethyl-[1,3]dioxan-5-ylamino)-thiophene-2-carboxylic acid methyl ester (200 mg, 0.57 mmol) in toluene (1 mL) and pyridine (100 μl, 1.23 mmol), acid chloride in toluene prepared above (1.1 mL, 1.05 mmol) was added. The reaction mixture was refluxed for 16 h. TLC showed the presence of starting material. Pyridine (50 μl, 0.62 mmol) and acid chloride in toluene (0.5 mL, 0.47 mmol) were added and the refluxing was continued for 24 h. The mixture was cooled to 5° C. Toluene (2 mL) and pyridine (0.2 mL) were added. After stirring for 5 min MeOH (0.5 mL) was added and the mixture was stirred for 10 min. It was diluted with ethyl acetate, washed with saturated NaHCO3 and brine, dried and evaporated. The crude reaction mixture was chromatographed over silica gel (hexane-ethyl acetate mixtures as eluents) yielding 5-bromo-3-[(2,2-dimethyl-[1,3]dioxan-5-yl)-(trans-4-methyl-cyclohexanecarbonyl)-amino]-thiophene-2-carboxylic acid methyl ester (35 mg) contaminated with a small impurity. This material was used for the next step.

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