Ethyl 2-(2-formyl-4-methoxyphenoxy)acetate → 2-Benzofurancarboxylic acid, 5-methoxy-, ethyl ester

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The above prepared (2-formyl-4-methoxy-phenoxy)-acetic acid ethyl ester (34.36 g, 144 mmol) was dissolved in 340 mL of dimethoxyethane and treated at −15° C. with KOtBu (6.47 g, 0.4 eq.). After 15 Min., the reaction mixture was poured onto crashed ice/NH4Cl, twofold extracted with AcOEt, washed with water and brine, dried over magnesium sulfate, and evaporated to dryness. Flash chromatography (SiO2, hexane/AcOEt=9/1) gave finally 8.10 g of the title compound as white crystals.

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