Methane, dichloromethoxy- → 7-(4-Fluorophenyl)-7-(3-formyl-6-hydroxy-2,4,5-trimethylphenyl)heptanoic acid

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Reaction Steps

To a solution of 7-(4-fluorophenyl)-7-(2-hydroxy-3,4,6-trimethylphenyl)heptanoic acid (7.5 g) and dichloromethyl methyl ether (5.7 ml) in dichloromethane (80 ml) was added a solution of titanium tetrachloride (6.9 ml) in dichloromethane (40 ml) over about 2 hours with ice-sodium chloride cooling. The reaction mixture was added to ice-water and the mixture was stirred for 30 minutes. The mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated saline and dried with anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting crystals were recrystallized from acetonitrile to obtain 7-(4-fluorophenyl)-7-(3-formyl-6-hydroxy-2,4,5-trimethylphenyl)heptanoic acid (7.8 g) (Compound 27). The physical properties and spectrum data thereof are shown in Tables 3 and 4.

Provenance & Evidence