m-Chloroperbenzoic acid → HCID 178517805, compound

Participants

Reaction Conditions

Reaction Steps

3-chloroperoxybenzoic acid (21 g) was added to a dichloromethane (200 ml) solution of 2-chloro-3-fluoropyridine (10 g), and the obtained mixture was stirred at 65° C. for 8 hours. The reaction solution was cooled on ice. A saturated sodium thio sulfate aqueous solution was added to the reaction solution, and the obtained mixture was stirred for 20 minutes. A saturated sodium bicarbonate aqueous solution was added to the reaction solution, and the mixture was extracted with chloroform. The obtained organic layer was dried over magnesium sulfate and then concentrated under reduced pressure. The residue was washed with t-butyl methyl ether/n-heptane (1/1), and the solid was collected by filtration. The obtained solid was dissolved in THF (150 ml). Triethylamine (13.2 ml) and trifluoroacetic acid anhydride (33.2 ml) were added to the solution, while the solution was stirred under cooling on ice. The obtained mixture was stirred at room temperature for 5 hours. A small amount of water was added to the reaction solution. Thereafter, a 5 N sodium hydroxide aqueous solution was added to the mixture, while the solution was stirred under cooling on ice. The obtained mixture was stirred at room temperature for 1 hour. The reaction solution was converted to the mild acidic range by addition of acetic acid, and it was then extracted with ethyl acetate. The obtained organic layer was washed with a saturated sodium chloride aqueous solution, then dried over magnesium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (n-heptane:ethyl acetate=19:1 to 1:1). The obtained solid was washed with t-butyl methyl ether/n-heptane (1/1) and then collected by filtration, so as to obtain the title compound (2.6 g).

Provenance & Evidence