Triethylamine → HCID 9951428, compound

Participants

Reaction Conditions

Reaction Steps

2,4-Difluoroaniline (1.51 g) was dissolved in ethyl acetate (33 ml) and the resultant solution was admixed with triethylamine (2.51 ml) with ice-cooling, and then treated dropwise with a solution of ethyl 2-chlorosulfonyl-5,5-dimethyl-1-cyclohexene-1-carboxylate (2.53 g) obtained in Reference Example 18 in ethyl acetate (17 ml). The reaction mixture was stirred under nitrogen flow at 0° C. for 30 minutes then at room temperature for 64.5 hours. The reaction mixture was diluted with ethyl acetate, and washed successively with water (120 ml), 0.5 N HCl (120 ml), water (120 ml×2) and saturated brine (120 ml). The ethyl acetate layer was dried over magnesium sulfate and the solvent was distilled off under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: ethyl acetate/hexane=1/9→1/7). A desired fraction was concentrated under reduced pressure, and the residue was crystallized from a mixture of ethyl acetate and diisopropyl ether to yield ethyl 6-[N-(2,4-difluorophenyl)sulfamoyl]-3,3-dimethyl-1-cyclohexene-1-carboxylate (Compound 83; 0.83 g) as white crystals.

Provenance & Evidence