Potassium Carbonate → 4-{5-[3-(5-tert-butyl-2-p-tolyl-2H-pyrazol-3-yl)-ureido]-pyridin-2-ylamino}-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

Add (5-tert-butyl-2-p-tolyl-2H-pyrazol-3-yl)-carbamic acid, 2,2,2-trichloro-ethyl ester (Preparation 38, 2.0 mmol, 0.8 g) over a solution of 4-(5-amino-pyridin-2-ylamino)-piperidine-1-carboxylic acid tert-butyl ester (2.0 mmol, 0.6 g) and potassium carbonate (2.20 mmol, 0.3 g) in acetonitrile (25 mL). Stir the solution for 12 hours at room temperature. Add water and extract with CH2Cl2. Combine the organic layers and wash with saturated aq. sodium chloride, dry over sodium sulfate, filter, and concentrate under reduced pressure to give a residue. Subject residue to silica gel chromatography eluting with CH2Cl2: MeOH in gradient (from 0.5 to 20%) to yield 4-{5-[3-(5-tert-butyl-2-p-tolyl-2H-pyrazol-3-yl)-ureido]-pyridin-2-ylamino}-piperidine-1-carboxylic acid tert-butyl ester. MS(ES+): m/z=548 [M+H])

Provenance & Evidence