[OH:1][C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][C:8](=[O:12])[O:9]2)=[CH:4][CH:3]=1.C(NCC)(C)C.[CH3:19][O:20][CH2:21]Cl.CCCCCC.C(OCC)(=O)C>CN(C)C=O>[CH3:19][O:20][CH2:21][O:1][C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][C:8](=[O:12])[O:9]2)=[CH:4][CH:3]=1To a solution of 7-hydroxycoumarin (100 g) and isopropylethylamine (161 ml) in anhydrous dimethylformamide (DMF; 500 ml) was added dropwise methoxymethylchloride (70.3 ml) at 0° C. under an atmosphere of argon. The mixture was stirred at room temperature for 4 hours. To the reaction mixture were added hexane/ethyl acetate (2/1, 1000 ml) and a saturated aqueous solution of sodium bicarbonate (1000 ml) and the mixture was extracted twice with ethyl acetate. The organic layer was washed with water (twice) and a saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate and concentrated to give the title compound (74.1 g) having the following physical data. The obtained crude product was used to the next step without further purification.
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