Methyl iodide → Methyl 2-(2-bromo-5-chlorophenyl)propanoate

Participants

Reaction Conditions

Reaction Steps

A solution of n-butyllithium (1.67 mL of a 2.5 M solution in hexanes, 4.17 mmol) was added dropwise via syringe to a stirred solution of diisopropylamine (0.61 mL, 4.36 mmol) in tetrahydrofuran (10 mL) at −78° C. After approximately 10 min, the reaction mixture was warmed to 0° C. and aged for another 10 min. After re-cooling to −78° C., a solution of methyl (2-bromo-5-chlorophenyl)acetate (1-2) (1.00 g, 3.79 mmol) in tetrahydrofuran (10 mL) was added dropwise via syringe and the resulting yellow mixture was stirred at −78° C. for approximately 30 min. Iodomethane (0.35 mL, 5.69 mmol) was added and after 1 h, the reaction mixture was warmed to ambient temperature and quenched with saturated aqueous ammonium chloride. The resulting mixture was poured into water and extracted three times with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. Purification of the crude residue by flash chromatography on silica gel (gradient elution; 0-20% ethyl acetate/hexanes as eluent) furnished 2-1 as a colorless oil (1.00 g).

Provenance & Evidence