Diisopropylethylamine → 4-{2-[5-Bromo-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 (1.41 g, 6.18 mmol) is added to a stirred suspension of 2-(5-bromo-2-chloropyrimidin-4-yl)-benzo[b]thiophene-4-carboxylic acid cyclopropylamide (0.75 g, 2.1 mmol) and diisopropylethylamine (0.80 g, 6.2 mmol) in anhydrous 1,4-dioxane (15 mL) at room temperature under nitrogen. The resultant mixture is heated in an oil bath at 90° C. for 12 hours. At room temperature the mixture is concentrated and chromatographed on silica gel, eluting with 2 M NH3/CH3OH in dichloromethane: 1-10%, to give 4-{2-[5-bromo-4-(4-cyclopropylcarbamoyl-benzo[b]thiophen-2-yl)-pyrimidin-2-ylamino]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester as a solid.

Provenance & Evidence