2-CHLORO-3,5-DIFLUOROANILINE

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 33.4 g of 2-chloro-1,3,5-trifluorobenzene and 200 ml of methanol saturated with ammonia gas at room temperature were sealed in a Teflon-coating autoclave and heated on an oil bath at 160° C. for 40 hours. After the reaction, the solvent and unreacted 2-chloro-1,3,5-trifluorobenzene were distilled off from the reaction mixture under reduced pressure, and the remaining mixture of a solid component and an oily component was extracted with ether to obtain an oily product in an amount of 31.7 g (yield of 2-chloro-3,5-difluoroaniline: 95% determined by GLC analysis). After the reaction the solvent and unreacted 2-chloro-1,3,5-trifluorobenzene were distilled off from the reaction mixture under reduced pressure the remaining mixture of a solid component an oily component was extracted with ether

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Into a 500 ml SUS autoclave, 45.4 g (purity: 98%, 0.272 mol) of 2-chloro-3,5-difluoroaniline, 1.84 g of 5% palladium-carbon, 30.2 g (0.299 mol) of triethylamine and 45.4 g of water were introduced, and hydrogen gas was sealed in. Then, the mixture was reacted under a hydrogen gas pressure of 15 kg/cm2 at a temperature of 100° C. for 4 hours. Then, the reaction solution was cooled to 50° C. Then, palladium-carbon was filtered off, and 50 g of a 25% sodium hydroxide aqueous solution was added. The mixture was stirred and left to stand still. Then, the oil layer was separated. Then, this oil layer was distilled to recover 28.5 g of triethylamine, and then 32.3 g (purity: 99%, yield: 91.0%) of 3,5-difluoroaniline was obtained. Then, the mixture was reacted under a hydrogen gas pressure of 15 kg/cm2 at a temperature of 100° C. for 4 hours Then, palladium-carbon was filtered off 50 g of a 25% sodium hydroxide aqueous solution was added left Then, the oil layer was separated Then, this oil layer was distilled to recover 28.5 g of triethylamine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The ester was prepared according to Procedure A using diethyl 2-methylmalonate (6.31 mL, 36.7 mmol), pyridine (3.96 mL, 48.9 mmol) and 2-chloro-3,5-difluoroaniline (4.00 g, 24.46 mmol) over 3 days. The residue was purified by column chromatography on silica gel (0-30% EtOAc/hexanes) to give ethyl 3-(2-chloro-3,5-difluorophenylamino)-2-methyl-3-oxopropanoate as a red oil. Mass Spectrum (ESI) m/e=292.0 (M+1). The ester was prepared The residue was purified by column chromatography on silica gel (0-30% EtOAc/hexanes)