2,4-Difluorophenyl isocyanate → HCID 86610810, compound

Participants

Reaction Steps

To a solution of 4-methyl-2-oxo-2H-chromene-7-carbonitrile (671 mg, 3.62 mmol) in dry THF (30 mL) at −20° C. was added drop wise 1.0 M LiHMDS solution in THF (5.4 mL). After 30 minutes 2,4-difluoro-1-isocyanato-benzene (224 mg) was added into the reaction mixture and the reaction mixture was then stirred for 1 hour. The reaction mixture was quenched with saturated aqueous ammonium chloride (25 mL) and extracted with ethyl acetate (50 mL). The organic layer was separated and dried over sodium sulfate, then concentrated and purified on silica gel eluted with 30%-100% ethyl acetate in hexanes to yield 2-(7-cyano-2-oxo-2H-chromen-4-yl)-N-(2,4-difluoro-phenyl)-acetamide as a yellow solid.

Provenance & Evidence