3-(3,4-dichlorophenyl)-N-methoxy-N-methylpropanamide → 4-(3,4-Dichlorophenyl)butan-2-one

Temperature

0 °C

At 0° C. to a solution of 3-(3,4-dichlorophenyl)-N-methoxy-N-methylpropanamide (569 mg, 2.17 mmol) in ether (10 mL) was added drop wise methyl magnesium bromide (2.17 mL, 6.51 mmol) and the solution was stirred at 0° C. for 1 h. The reaction mixture was allowed to warm up to rt and stirred for 18 h. The reaction mixture was cooled to 0° C. and brine was added to quench the reaction. The aqueous layer was extracted with DCM three times. The combined organic layers were dried over MgSO4, filtered and concentrated. The residue was purified by ISCO chromatography (EtOAc/Hexanes 0-50% over 20 min, column 40 g, flow rate 40 mL/min) to give Intermediate 15B (292 mg, 1.34 mmol, 62.0% yield) as a yellow oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.15 (3H, s), 2.75 (2H, t, J=6.9 Hz), 2.80-2.90 (2H, m), 7.02 (1H, dd, J=8.2, 2.2 Hz), 7.28 (1H, d, J=2.2 Hz), 7.33 (1H, d, J=8.2 Hz).

1. temperatureto warm up to rt
2. stirringstirred for 18 h
3. temperatureThe reaction mixture was cooled to 0° C.
4. customto quench
5. customthe reaction
6. extractionThe aqueous layer was extracted with DCM three times
7. dry with materialThe combined organic layers were dried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was purified by ISCO chromatography (EtOAc/Hexanes 0-50% over 20 min, column 40 g, flow rate 40 mL/min)

ORD record

ord-e7ba26e52c0c431eb4994e76acf33c23

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09249096B2