Hydrochloric Acid → Methyl 4-[7-(2,5-dimethoxy-3,4,6-trimethylphenyl)-7-phenylheptoxy]benzoate

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Reaction Conditions

Reaction Steps

A 0.42 g (10×1.05 mmole) quantity of sodium hydride (60%, oily preparation) was added to a solution of 1.52 g (10.0 mmole) of methyl p-hydroxybenzoate in dimethylformamide (15 ml) under ice-cooling, followed by stirring for 5 minutes. The cooling bath was removed, and a solution of 4.80 g (10.0 mmole) of 1-iodo-7-(2,5-dimethoxy-3,4,6-trimethylphenyl)-7-phenylheptane in dimethylformamide (15 ml) was added to the mixture. Then, the temperature was raised to 50° C., and stirring was effected for 1 hour. After ice-cooling, dilute hydrochloric acid was added to suspend the reaction, and the product was extracted with isopropyl ether. The isopropyl ether layer was separated out, washed with aqueous sodium chloride solution, dried (magnesium sulfate) and evaporated. The residual solution was chromatographed on a silica gel column to perform purification (elution with hexane/isopropyl ether) to thereby give 4.95 g (98%) of methyl 4-[7-(2,5-dimethoxy-3,4,6-trimethylphenyl)-7-phenylheptoxy]benzoate. Its typical physical properties and nuclear magnetic resonance spectrum data are shown in Table 14.

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