4-Chlorophenyl Isocyanate → 4-bromo-N-(2,2,2-trichloro-1-(4-chlorophenylamino)ethyl)furan-2-carboxamide

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Reaction Steps

was prepared in accordance with reported methods: see Ulrich, H. et al J Org. Chem., 33, 1968, 2887. A solution of 4-bromo-N-(2,2,2-trichloro-1-hydroxyethyl)furan-2-carboxamide (preparation as for 6 above) (0.566 g, 1.67 mmol), 1-chloro-4-isocyanato-benzene (0.264 g, 1.68 mmol) and triethylamine (2 drops) in benzene (4 mL) was heated at 95° C. for 1.5 h. The mixture was evaporated under reduced pressure. The residue was solvated with chloroform and concentrated onto silica gel. Chromatographic purification on an auto-column with 30% dichloromethane in hexanes gave 4-bromo-N-(2,2,2-trichloro-1-(4-chlorophenylamino)ethyl)furan-2-carboxamide (Compound 33) as a white solid; 422 mg (57%).

Provenance & Evidence