Diisopropylethylamine → 4-{3-[4-(4-Cyclopropylcarbamoyl-benzo[b]thiophen-2-yl)-5-fluoropyrimidin-2-ylamino]-propyl}-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

4-(3-Aminopropyl)-piperidine-1-carboxylic acid tert-butyl ester (0.557 g, 2.30 mmol) is added to a stirred suspension of 2-(2-chloro-5-fluoropyrimidin-4-yl)-benzo[b]thiophene-4-carboxylic acid cyclopropylamide (0.400 g, 1.15 mmol) and diisopropylethylamine (0.60 mL, 3.5 mmol) in anhydrous 1,4-dioxane (8 mL) at room temperature under nitrogen. The resultant mixture is heated in an oil bath at 95° C. for 34 hours. At room temperature the mixture is concentrated and chromatographed on silica gel, eluting with CH3OH in dichloromethane: 0-2%, to give 4-{3-[4-(4-cyclopropylcarbamoyl-benzo[b]thiophen-2-yl)-5-fluoropyrimidin-2-ylamino]-propyl}-piperidine-1-carboxylic acid tert-butyl ester (0.512 g) as a solid.

Provenance & Evidence