反应详情

A solution of the product of Example 26a (553 mg, 1.557 mmol) in anhydrous DMF (15 mL) was treated with 4-mercaptophenol (196 mg, 1.557 mmol) and cesium carbonate (1.015 g, 3.114 mmol) at room temperature, then heated at 100° under a nitrogen atmosphere for 3 hours. The reaction was cooled to room temperature and the solvent concentrated under vacuum giving the title compound. The residue was taken up in H2O (30 mL) and the pH adjusted to 3 with 1N aqueous HCl. The aqueous was then extracted with ethyl acetate, and the combined organic extracts washed with brine (25 mL). The organic layer was dried over Na2SO4, filtered and concentrated under vacuum giving the title compound. The residue was triturated with methylene chloride and purified by silica gel flash chromatography with a gradient of 6% to 30% ethyl acetate/methylene chloride to afford the title product as a dark yellow solid (517 mg, 1.16 mmol, 75%).

1. temperatureheated at 100° under a nitrogen atmosphere for 3 hours
2. concentrationthe solvent concentrated under vacuum