Tetrafluoro-m-phenylenediamine dihydrochloride → HCID 178482521, compound

Participants

Reaction Steps

To a well stirred suspension of 3,4-dimethoxy-1,2,5-thiadiazole 1,1-dioxide (2.5 g; 14.0 mmoles) in 250 ml of dry methanol that had been cooled to 2° in an ice-water bath was added dropwise over a period of 25 minutes a solution of 2-[(5-methyl-1-H-imidazol-4-yl)methylthio]ethylamine (from the dihydrochloride, 3.42 g; 14.0 mmoles) in 25 ml of methanol. After stirring at 2° for 20 minutes, anhydrous methylamine was bubbled into the solution for 6 minutes and stirring was continued at ambient temperature for 30 minutes. The reaction mixture was evaporated under reduced pressure and the residue was placed on 50 g of silica gel and chromatographed by gradient elution using methylene chloride-methanol. The appropriate fractions were combined to give 3.2 g of the title compound. Additional purification of the product using column chromatography gave an analytical sample of the title compound as an amorphous solid, mp 98°-110°. The NMR spectrum (100 MHz) in d6 dimethyl sulfoxide gave the following resonances δ: 7.46 (s, 1H); 3.70 (s, 2H); 2.53 (t, 2H); 2.86 (s, 3H); 2.72 (t, 2H); 2.15 (s, 3H).

Provenance & Evidence