Thionyl Chloride → 3-Iodo-4-methylbenzoyl chloride

Participants

Reaction Steps

A solution of 3-iodo-4-methylbenzoic acid (10.0 g, 38.2 mmol) in thionyl chloride (30.0 mL) was heated at reflux for 3 hours. The resulting yellow solution was cooled to room temperature and concentrated under reduced pressure to afford 3-iodo-4-methylbenzoyl chloride. A solution of 3-iodo-4-methylbenzoyl chloride (1 g, 4 mmol) in dichloromethane (10 mL) was added slowly to a 0° C. solution of 3-amino-4-fluorobenzotrifluoride (0.7 ml, 4 mmol) and diisopropylethylamine (0.9 ml, 5 mmol) in dichloromethane (10 mL). The reaction stirred at 0° C. and warmed to room temperature over 20 hours. The reaction mixture was purified via column chromatography on silica gel (gradient elution with 0 to 100% ethyl acetate-hexane) to afford N-(2-fluoro-5-(trifluoromethyl)phenyl)-3-iodo-4-methylbenzamide 34 MS m/z found 423.9 [MH+]; calc. for C15H10F4INO=423.14.

Provenance & Evidence