Pyridine → HCID 59623721, compound

Participants

Reaction Steps

To a solution of 3-amino-pyrazine-2-carboxylic acid methyl ester (commercially available) (2.0 g) and (2-chloro-5-trifluoromethyl-phenyl)-methanesulfonyl chloride (Example 1.2) (4.2 g) in dichloromethane (32 ml) was added dropwise pyridine (5.3 ml) over a period of 5 minutes at ambient temperature. The reaction mixture was stirred at ambient temperature for 23 hours. Dichloromethane (50 ml) was added to the reaction mixture and the mixture was washed with aqueous sulfuric acid (2M) (3×30 ml). The phases were separated and the organic layer was concentrated. The residue was purified by column chromatography on silica gel (eluent: ethyl acetate/dichloromethane from 0:10 to 1:9) to give 3-(2-chloro-5-trifluoromethyl-phenylmethanesulfonylamino)-pyrazine-2-carboxylic acid methyl ester as a white solid (4.728 g). 1H-NMR (400 MHz, CDCl3): 10.30 (s, 1H), 8.59 (s, 1H), 8.47 (s, 1H), 7.77 (bs, 1H), 7.54-7.60 (m, 2H), 5.15 (s, 2H), 4.04 (s, 3H) ppm.

Provenance & Evidence