Ethyl chloroformate → HCID 69130224、化合物

2-{4-[4-(2-Carbamoyl-ethyl)-phenoxy]-phenyl }-3-(3,5-dimethoxyphenyl)-acrylic acid methyl ester (7) was obtained as a byproduct in the synthesis of 3-(3,5-dimethoxy-phenyl)-2-{4-[4-(2,4-dioxothiazolidin-5-ylmethyl)-phenoxy]-phenyl}-acrylic acid methyl ester, performed essentially as shown in PCT/US99/09982 (WO 99/58127). 7 (460 mg, 1.0 mmol) was taken up in dry THF (6 mL) and cooled to −78° C. To this solution, lithium diisopropyl amide (LDA) (2M, 0.55 mL, 1.1 mmol) was added and stirred for 10 min. Ethyl chloroformate (0.11 mL, 1.2 mmol) was added and stirred overnight at room temperature. The reaction was quenched with saturated aqueous ammonium chloride solution and ethyl acetate (50 mL) was added. The organic layer was washed with brine (2×20 mL), dried on anhydrous magnesium sulfate and evaporated under reduced pressure. The crude product was purified by silica gel chromatography and eluted with hexane-ethyl acetate (7:3). Yield: 264 mg, 49.8%.