[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:17]=[CH:16][C:11]([C:12]([O:14][CH3:15])=[O:13])=[CH:10][CH:9]=2)=[CH:4][CH:3]=1.[CH:18]1(O)[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[CH:18]1([O:1][C:2]2[CH:3]=[CH:4][C:5]([C:8]3[CH:17]=[CH:16][C:11]([C:12]([O:14][CH3:15])=[O:13])=[CH:10][CH:9]=3)=[CH:6][CH:7]=2)[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1To a solution of methyl 4-(4-hydroxyphenyl)benzoate (3.00 g) and cyclohexanol (1.58 g) in tetrahydrofuran (60 ml) was added dropwise diethyl azodicarboxylate (2.48 ml) at 0-10° C. under nitrogen atmosphere, and the mixture was stirred at ambient temperature for 4 hours. After concentration, to the residue was added ethyl acetate (50 ml) and n-hexane (10 ml), and the resulting precipitate was removed by filtration and discarded. To the filtrate was added silica gel (12 g) and the mixture was evaporated. The residue was purified by column chromatography on silica gel (80 g) eluting with a mixed solvent of 5% ethyl acetate in n-hexane to give methyl 4-(4-cyclohexyloxyphenyl)benzoate (1.79 g) as a white solid.
Loading…
