2,3-二氢苯并呋喃-2-羧酸甲酯

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of methyl 2,3-dihydrobenzofuran-2-carboxylate (Step A, 1.0 g, 5.5 mmol) and methyl iodide (1.8 mL, 28 mmol) in 20 mL of anhydrous tetrahydrofuran at −78° C. was added potassium tert-butoxide (1 M in tetrahydrofuran, 8.4 mL, 8.4 mmol). The reaction was allowed to warm to room temperature overnight, and the resulting mixture was diluted with ethyl acetate (100 mL), washed with aqueous saturated ammonium chloride (100 mL) and water, dried over anhydrous sodium sulfate, filtered and concentrated to dryness. The residue was purified by flash column chromatography eluted with 2-5% ethyl acetate in hexane to give the title compound. 1H NMR (500 MHz, CD3OD): δ 7.16 (d, 1H), 7.12 (t, 1H), 6.86 (t, 1H), 6.76 (d, 1H), 3.75 (s, 3H), 3.58 (d, 1H), 3.17 (d, 1H), 1.66 (s, 3H). washed with aqueous saturated ammonium chloride (100 mL) and water dried over anhydrous sodium sulfate filtered concentrated to dryness The residue was purified by flash column chromatography eluted with 2-5% ethyl acetate in hexane