Pyridine → 2-(3-ethylpyridin-4-yl-)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.40 g of N2-methyl-5-trifluoromethylpyridine-2,3-diamine, 0.41 g of 3-ethylisonicotinic acid, 0.44 g of WSC and 10 ml of pyridine was stirred for 2.5 hours at 120° C. The reaction mixture was cooled down to room temperature. Into the reaction mixture was poured water, and the mixture was extracted three times with ethyl acetate. The organic layer was dried over magnesium sulfate, then, concentrated under reduced pressure. To the residue was added a mixture of 0.60 g of p-toluenesulfonic acid monohydrate and 10 ml of toluene, and the mixture was stirred for 7 hours at 120° C. The reaction mixture was cooled down to room temperature. Into the reaction mixture was poured water, and the mixture was extracted three times with ethyl acetate. The organic layer was dried over magnesium sulfate, then, concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 0.10 g of 2-(3-ethylpyridin-4-yl-)-3-methyl-6-trifluoromethyl-3H-imidazo[4,5-b]pyridine (hereinafter, referred to as present active compound 217).

Provenance & Evidence