Diisopropylethylamine → 4-{4-[7-(3-tert-Butylsulfamoyl-phenyl)-pyrrolo[2,1-f][1,2,4]triazin-2-ylamino]-3-methoxy-phenyl}-piperidine-1-carboxylic acid tert-butyl ester

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In a 10 mL sealed tube, to N-tert-Butyl-3-(2-hydroxy-pyrrolo[2,1-f][1,2,4]triazin-7-yl)-benzenesulfonamide (120 mg, 0.3464 mmol) and N,N-Diisopropylethylamine (0.242 mL, 1.39 mmol) in 3.0 mL of anhydrous DMF was added N-Phenylbis(trifluoromethane-sulfonimide (136 mg, 0.381 mmol). After stirring at room temperature for 30 minutes, 4-(4-Amino-3-methoxy-phenyl)-piperidine-1-carboxylic acid tert-butyl ester (140 mg, 0.460 mmol) was added. The reaction mixture was heated at 65° C. for 2.5 days. The reaction mixture was purified via silica gel column chromatography using 100:1 DCM:MeOH as the eluant. The collected fractions afforded impure 4-{4-[7-(3-tert-Butylsulfamoyl-phenyl)-pyrrolo[2,1-f][1,2,4]triazin-2-ylamino]-3-methoxy-phenyl}-piperidine-1-carboxylic acid tert-butyl ester as a sticky brown solid.

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