Propanoic acid, 2-bromo-2-methyl-, ethyl ester → Deschloroclofibrate

関与物質

反応手順

To a solution of potassium t-butoxide (1M in THF, 531ml, 0.531moles, 1eq) precooled to 0° C. (ice bath) was added phenol (50g, 0.531moles, 1eq) in dry THF (50ml) dropwise via an addition funnel over 20minutes maintaining the internal temperature of the reaction below 5degrees centigrade. Ethyl-2-bromoisobutyrate (70.14ml, 0.9eq, 0.478moles) in dry THF (20ml) was added dropwise over 10minutes maintaining the internal reaction temperature below 5° C. After the addition was complete, the ice bath was removed and the reaction was allowed to warm to room temperature. The reaction was brought to reflux and maintained at this reflux temperature for 8hours. Following the cooling of the reaction to 0° C. the volatiles were removed in vacuo. The residue was then partitioned between EtOAc and 1N NaOH. The phases were separated and the organic phase washed with 1N NaOH, H2O, brine and dried over Na2SO4. After filtration the solution was concentrated under reduced pressure to yield 83g (75%) of clean title compound.

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