N-Ethylaniline → 4-chloro-N-ethyl-2-iodo-N-phenyl-benzamide

Temperature

23 °C

Oxalyl chloride (2.3 ml, 3.4 g, 26.6 mmol) was added dropwise to a solution of 2-iodo-4-Chlorobenzoic acid (5 g, 17.7 mmol) in dichloromethane (35 ml). N,N-Dimethylformamide (0.01 ml) was added to the reaction mixture via syringe and the reaction mixture was stirred at 23° C. for an hour. The reaction mixture was concentrated in vacuo. The residue was taken up in dichloromethane (50 ml) followed by the addition of DMAP (10 mg) and triethylamine (3.73 ml, 2.7 g, 26.6 mmol). The mixture was cooled to 0° C. and N-ethylaniline (2.6 ml, 2.6 g, 21.2 mmol) was added. The reaction mixture was warmed to 23° C. After an hour at this temperature, the reaction mixture was diluted with 1:1 ethyl acetate/hexanes (150 ml) and washed with 1N HCl (2 50-ml portions) and saturated aqueous sodium chloride (50 ml). The organics were dried over anhydrous sodium sulfate and concentrated. Purification of the residue by flash column chromatography (25% ethyl acetate in hexanes) afforded 4-chloro-N-ethyl-2-iodo-N-phenyl-benzamide I-14a (6.0 g, 88%).

1. concentrationThe reaction mixture was concentrated in vacuo
2. temperatureThe mixture was cooled to 0° C.
3. temperatureThe reaction mixture was warmed to 23° C
4. waitAfter an hour at this temperature
5. washwashed with 1N HCl (2 50-ml portions) and saturated aqueous sodium chloride (50 ml)
6. dry with materialThe organics were dried over anhydrous sodium sulfate
7. concentrationconcentrated
8. customPurification of the residue by flash column chromatography (25% ethyl acetate in hexanes)

ORD record

ord-592d11f187da40ebab2fbe739f90b767

Source dataset

uspto-grants-2005_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06958347B2