Triethylamine → 5-chloro-N-(4-methyl-1,2,5-oxadiazol-3-yl)-3-(trifluoromethyl)pyridine-2-carboxamide

Participants

Reaction Steps

300 mg (1.33 mmol) of 5-chloro-3-(trifluoromethyl)pyridine-2-carboxylic acid and 132 mg (1.33 mmol) of 4-methyl-1,2,5-oxadiazol-3-amine are dissolved at RT in 10 ml of CH2Cl2, and 0.19 ml (1.33 mmol) of triethylamine, 32 mg (0.27 mmol) of DMAP and 1.27 g (2.00 mmol) of 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide (50% solution in THF) are added. The reaction mixture is stirred at RT for 20 h and then washed twice with 10 ml each time of water. The organic phase is dried over Na2SO4 and concentrated. The residue is purified by column chromatography (silica gel, heptane/ethyl acetate). Yield: 250 mg (61%).

Provenance & Evidence