Diisopropylethylamine → 4-{3-[4-(Benzo[b]thiophen-2-yl)-5-methyl-pyrimidin-2-yl]-amino-propyl}-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

4-(3-Aminopropyl)-piperazine-1-carboxylic acid tert-butyl ester (261 mg, 1.07 mmol) is added to a stirred suspension of 4-(benzo[b]thiophen-2-yl)-2-chloro-5-methyl-pyrimidine (140 mg, 0.537 mmol) and diisopropylethylamine (140 μL, 0.805 mmol) in anhydrous 1,4-dioxane (3.5 mL) at ambient temperature under nitrogen. The resultant mixture is heated in an oil bath at 95° C. for 36 hours. At ambient temperature the mixture is concentrated and chromatographed on silica gel, eluting with 2 M NH3/CH3OH in dichloromethane 0-6%, to give 4-{3-[4-(benzo[b]thiophen-2-yl)-5-methyl-pyrimidin-2-yl]-amino-propyl}-piperazine-1-carboxylic acid tert-butyl ester as a white solid (178 mg, 70% yield).

Provenance & Evidence