Hydrochloric Acid → 3-methoxy-4-[(E)-3-oxo-3-(2-phenylamino-pyridin-3-yl)-propenyl]-benzoic acid methyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 1-(2-phenylamino-pyridin-3-yl)-ethanone (833 mg, 3.92 mmol) in methanol (16.5 mL) at 25° C. was treated with 4-formyl-3-methoxy-benzoic acid methyl ester (508 mg, 2.61 mmol) and sodium methoxide in methanol (4.37M, 1.2 mL, 5.23 mmol). The reaction was stirred at 25° C. for 48 h. At this time, the reaction was diluted with water (100 mL), neutralized with a 1N aqueous hydrochloric acid solution, and extracted with methylene chloride (3×75 mL). The combined organics were dried over sodium sulfate filtered and concentrated in vacuo. Flash chromatography (40 g silica column, 10-50% ethyl acetate/hexanes) afforded 3-methoxy-4-[(E)-3-oxo-3-(2-phenylamino-pyridin-3-yl)-propenyl]-benzoic acid methyl ester (880 mg, 86.8%) as a red solid. ES+-HRMS m/e calcd for C23H20N2O4 [M+H+] 389.1496. Found 389.1494.

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