Diisopropylethylamine → 4-{2-[5-Chloro-4-(4-cyclopropylcarbamoyl-benzo[b]thiophen-2-yl)-pyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

4-(2-aminoethyl)-piperidine-1-carboxylic acid tert-butyl ester (0.390 g, 1.72 mmol) is added to a stirred suspension of 2-(2,5-dichloro-pyrimidin-4-yl)-benzo[b]thiophene-4-carboxylic acid cyclopropylamide (0.250 g, 0.686 mmol) and diisopropylethylamine (0.300 mL, 1.72 mmol) in anhydrous 1,4-dioxane (4 mL) at room temperature under nitrogen. The resultant mixture is heated at 95° C. for 12 hours then cooled to room temperature and purified (silica gel chromatography, eluting with 2 M NH3/CH3OH in dichloromethane: 0 to 7%) to give 4-{2-[5-chloro-4-(4-cyclopropylcarbamoyl-benzo[b]thiophen-2-yl)-pyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester as a solid.

Provenance & Evidence