3-Chlorophenylacetic acid → HCID 86731822, compound

Participants

Reaction Conditions

Reaction Steps

Sodium bis(trimethylsilyl)amide (1 M in tetrahydrofuran, 4 L, 4000 mmol) was added over 1 hour to a solution of 3-chlorophenyl acetic acid (250.0 g, 1465 mmol) in anhydrous tetrahydrofuran (1.75 L) at −78° C. under nitrogen. The resulting reaction mixture was stirred for an additional hour at −78° C. Then, a solution of methyl-4-chloro-3-fluorobenzoate (221.0 g, 1175 mmol, Example 4, Step A) in tetrahydrofuran (500 mL) was added over 1 hour at −78° C., and the resulting reaction mixture was stirred at the same temperature for 2 hours. The reaction was monitored by TLC. On completion, reaction mixture was quenched with 2 N hydrochloric acid (2.5 L) and aqueous phase was extracted with ethyl acetate (2×2.5 L). The combined organic layer was washed with brine (2.5 L), dried over anhydrous sodium sulfate and concentrated under reduced pressure to provide the crude material which was purified by flash column chromatography (silica gel: 100 to 200 mesh, product eluted in 2% ethyl acetate in hexane) to afford the title compound as a white solid.

Provenance & Evidence