Water → 4-[5-(2-Fluoro-4-aminocarbonyl-phenyl)-furo[2,3-c]pyridin-2-yl]-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

A flask is charged under Ar atmosphere with a stir bar, 4-[5-chloro-2-(4-cyano-2-fluoro-phenyl)-pyridin-4-ylethynyl]-piperidine-1-carboxylic acid tert-butyl ester (110 mg), powdered KOH (42 mg), 2-di-tert-butylphosphino-2,4,6-triisopropylbiphenyl (8 mg), tris(dibenzylideneacetone)dipalladium(0) chloroform adduct (6 mg), water (1.5 mL), and 1,4-dioxane (3 mL). The mixture is heated to 110° C. and stirred at this temperature for 2 h. After cooling the mixture to room temperature, water is added and the resulting mixture is extracted with ethyl acetate. The combined extracts are washed with brine, dried (Na2SO4), and concentrated. The residue is chromatographed on silica gel [dichloromethane/(dichloromethane/methanol/7 M ammonia in methanol 50:48:2) 9:1] to give the title compound. LC (method 3): tR=1.26 min; Mass spectrum (ESI+): m/z=440 [M+H]+.

Provenance & Evidence