1-Bromo-3-chloropropane → 5-Chloro-2-(4-chlorophenyl)-2-methylpentanoic acid

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, to a mixture of 2-(4-chlorophenyl)propanoic acid (13.3 g) in THF (140 mL) was added n-butyllithium (1.6M hexane solution, 90.3 mL) at −60° C. to —70° C., and the mixture was allowed to warm to −20° C. 1-Bromo-3-chloropropane (11.4 g) was added to the reaction mixture at −20° C. to 10° C., and the mixture was stirred at room temperature for 12 hr. The reaction mixture was extracted with 1N aqueous sodium hydroxide solution (2×100 mL), and the extract was acidified with 3N hydrochloric acid (100 mL). The mixture was extracted with ethyl acetate (3×100 mL), the extract was dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (15.7 g).

Provenance & Evidence