4-Aminobutyric acid methyl ester hydrochloride → 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-N-(2-hydroxy-ethoxy)-5-(2-oxo-pyrrolidin-1-ylmethyl)-benzamide

Participants

Reaction Steps

Methyl 4-amino-butyrate hydrochloride (commercially available, 48 mg, 0.312 mmol) and sodium cyanoborohydride (20 mg, 0.312 mmol) were added to a solution of 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-5-formyl-N-(2-hydroxy-ethoxy)-benzamide (50 mg, 0.104 mmol) obtained in Step F of Example 1 in methanol (2.0 mL). The mixture was stirred at room temperature for 18 hours. Then, the reaction vessel was equipped with a reflux condenser, and the mixture was heated at 80° C. for 2 hours. After completion of the reaction, the reaction mixture was extracted with ethyl acetate, and the organic layer was washed sequentially with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resultant residue was purified by silica gel flash chromatography (Mega Bond Elut, Varian, 5% methanol/methylene chloride as an eluent) to give 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-N-(2-hydroxy-ethoxy)-5-(2-oxo-pyrrolidin-1-ylmethyl)-benzamide (Compound H-3, 26.8 mg, 47%) as a white solid.

Provenance & Evidence