Tetrafluoro-m-phenylenediamine dihydrochloride → L 643441

Participants

Reaction Steps

A solution of 3-(3-piperidinomethylphenoxy)propylamine (from the dihydrochloride, 4.0 g; 12.4 mmoles) in 40 ml of methanol was added dropwise over a period of 50 minutes to a solution of 3,4-dimethoxy-1,2,5-thiadiazole 1-oxide (2.01 g; 12.4 mmoles) in 200 ml of methanol that had been cooled to 0° in an ice-water bath. After 15 minutes, anhydrous ammonia was bubbled into the solution for 5 minutes and the solution then was stirred at ambient temperature for 17 hours. The reaction mixture was evaporated under reduced pressure and the residue chromatographed by flash chromatography on 100 g of silica gel (230-400 mesh) using methanol-acetonitrile. The appropriate fractions were combined and evaporated to give 4.18 g of product. Recrystallization from 95% aqueous ethanol yielded the title compound, mp 155°-157° (dec.).

Provenance & Evidence