反应详情

A solution of 2-(5-hydroxy-2,4,6,7-tetramethyl-2,3-dihydrobenzo[1,2-b]furan-2-yl)ethanol (1.30 g, 5.51 mmol) and 6-methoxy-a-methyl naphthaleneacetic acid (Aldrich, 1.39 g, 6.06 mmol) was stirred in the presence of dimethylaminopyridine (0.67 g, 5.51 mmol) and 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride (1.06 g, 5.51 mmol), in tetrahydrofuran (25 mL). The reaction mixture was stirred at ambient temperature under nitrogen for 24 hours, diluted with ethyl acetate (150 mL), washed with water (2×40 mL) and then brine (30 mL). The organic extract was dried (sodium sulfate) and concentrated in vacuo. The residue was subjected to flash chromatography (silica gel, 100-50:0-50, v:v, hexanes:ethyl acetate), and the appropriate fractions were combined to give 1.84 g (74.5% yield) of a foam residue. Fractional crystallization and recrystallization from methylene chloride-hexanes gave 0.40 g (13.0% yield) of white solid.

1. washwashed with water (2×40 mL)
2. extractionThe organic extract
3. dry with materialwas dried (sodium sulfate)
4. concentrationconcentrated in vacuo