Acetic Acid → Methyl 2-{[(2-bromopyridin-4-yl)methyl]amino}benzoate

Participants

Reaction Conditions

Reaction Steps

6.04 g (40 mmol) of anthranilic acid methyl ester in 600 ml of methanol is mixed with 3.2 ml of acetic acid and 7.4 g (40 mmol) of 2-bromopyridine-4-carbaldehyde and stirred overnight at 40° C. 3.8 g (60 mmol) of sodium cyanoborohydride is added thereto and stirred overnight at 40° C. 3.8 g (60 mmol) of sodium cyanoborohydride is added again and stirred over the weekend at 40° C. It is mixed with water and largely concentrated by evaporation. The aqueous phase is extracted with ethyl acetate, and the combined organic phases are dried, filtered and concentrated by evaporation. The crude product is chromatographed on silica gel with a gradient that consists of hexane and hexane/ethyl acetate 1:3 and hexane/ethyl acetate 1:1 as an eluant. 10.0 g (78% of theory) of 2-[(2-bromo-pyridin-4-ylmethyl)-amino]-benzoic acid methyl ester is obtained as a colorless oil.

Provenance & Evidence