Hydrochloric Acid → HCID 68997620, compound

Participants

Reaction Steps

A solution of 3-amino-4-[2-(1H-indazol-3-yl)vinyl]benzoic acid methyl ester (0.30 g, 1.0 mmol) obtained in Step 1 of Example 217 and triethylamine (0.43 ml, 3.1 mmol) in THF (10 mL) was added with furan-2-carbonyl chloride (0.11 mL, 1.1 mmol), followed by stirring for 4 hours. The reaction mixture was extracted with ethyl acetate and saturated aqueous sodium hydrogencarbonate solution. The organic layer was concentrated under reduced pressure to obtain crude product. Further, the product was dissolved in methanol (20 mL) and added with 2 mol/L aqueous sodium hydroxide solution (5.0 mL), followed by stirring at 60° C. for 1 hour. The reaction mixture was acidified by hydrochloric acid (6 mol/L) and the precipitated crystal was collected by filtration to obtain (E)-4-[2-(1H-indazol-3-yl) vinyl]-3-[(furan-2-carbonyl)amino]benzoic acid (0.31 g, 82%).

Provenance & Evidence