Ammonium Chloride → 2-Cyclopentyl-2-hydroxy-4-methyl-4-phenylpentanoic Acid-ethyl Ester

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Reaction Steps

2.13 ml of a 2 M ethereal cyclopentyl magnesium chloride solution is added in drops at −70° C. to a solution of 1.0 g of 4-methyl-4-phenyl-2-oxopentanoic acid-ethyl ester in 20 ml of THF. After 3 hours at −70° C., the batch is poured into cold, saturated NH4Cl solution and extracted with ethyl acetate. The extracts are dried (Na2SO4) and concentrated by evaporation. Column chromatography on silica gel with ethyl acetate-cyclohexane yields 320 mg of the product.

Provenance & Evidence