Dimethylcarbamoyl Chloride → Dimethyl-carbamic acid 2-cyano-5-fluoro-phenyl ester

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Reaction Steps

Under N2, a stirred solution of 4-fluoro-2-hydroxybenzonitrile (685 mg, 5.00 mmol), dimethylcarbamoyl chloride, and triethylamine (606 mg, 6 mmol) in dichloromethane (10 mL) was heated at reflux for 20 hrs. The cooled mixture was diluted with dichloromethane (10 mL) washed with water, and brine. The organic layer was separated, dried (Na2SO4), concentrated, and the residue purified by column chromatography (SiO2, 5% ethyl acetate-CH2Cl2) to provide 700 mg (Yield 67%) of the title compound as a white crystalline solid: 1H NMR (CDCl3, 500 MHz) δ ppm: 3.03 (3H, s, NMe), 3.15 (3H, s, NMe), 6.99 (1H, dt, J=2.5 Hz, 8.5 Hz, Ar—H), 7.23 (1H, dd, J=2.5 Hz, 9.5 Hz, Ar—H), 7.61 (1H, dd, J=9 Hz, 6 Hz, Ar—H); 13C NMR (CDCl3, 125.77 Hz) δ ppm: 36.76, 37.06, 102.84, 102.86, 111.59, 111.79, 113.24, 113.42, 114.99, 134.36, 134.45, 152.54, 155.06, 155.16, 164.26, 166.31. HRMS (ESI) calcd for C10H10N2O2F (M+H) 209.0726, found 209.0722.

Provenance & Evidence