Isobutyl chloroformate → But-2-ynoic acid, [4-(3-bromo-phenylamino)-3-cyano-[1,7]naphthyridin-6-yl]-amide

Participants

Reaction Steps

To 100 mg of butynoic acid in 5 mL of anhydrous tetrahydrofuran under an inert atmosphere at 0° C. was added 0.23 mL on N-methyl morpholine and 0.15 mL of isobutyl chloroformate. This solution was then added to 150 mg of 6-amino-4-(3-bromo-phenylamino)-[1,7]naphthyridine-3-carbonitrile in 3 mL of pyridine at 0° C. After standing at 0° C. for three days, a second portion of butynoyl chloride was added. After an additional 8 hours the reaction was stripped of solvents on a rotary evaporator and the crude product was purified by flash chromatograph using a gradient of 0-20% methanol/chloroform to give 15 mg of but-2-ynoic acid, [4-(3-bromo-phenylamino)-3-cyano-[1,7]naphthyridin-6-yl]-amide: melting point 255° C. (decomposed); mass spectrum (m/e): M+H 406.1, 408.2.

Provenance & Evidence