Sodium hydride → 4-[2-(3-Methyl-[1,2,4]oxadiazol-5-yl)-vinyl]-benzene-1,2-diol

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Reaction Steps

A solution of N-hydroxy-acetamidine (0.17 g, 2.29 mmol) in dry tetrahydrofuran (5 mL) was added slowly into the suspension of 60% sodium hydride (0.14 g, 3.5 mmol) in dry tetrahydrofuran (5 mL) under nitrogen atmosphere at 0° C. to 10° C. The reaction mixture was stirred for 30 min at room temperature. 3-[3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-phenyl]-acrylic acid methyl ester (compound of Example 1, Step 1; 0.5 g, 1.18 mmol) in dry tetrahydrofuran (5 mL) was added into the reaction mixture and heated at 60° C. for 8 h. The reaction mixture was cooled at 0° C. and quenched with MeOH (2 mL) to destroy excess sodium hydride. The reaction mixture was extracted with ethyl acetate (2×10 mL) and the combined organic layers were washed with water (2×10 mL) followed by brine (10 mL). The organic phase obtained was dried over anhydrous sodium sulphate and concentrated to dryness. The crude product obtained was purified by column chromatography (silica gel, chloroform-methanol) to afford the title compound.

Provenance & Evidence