Triphenylphosphine → {1-[2-(6-Methoxy-[1,5]naphthyridin-3-yloxy)-ethyl]-piperidin-4-yl}-carbamic acid tert-butyl ester

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Reaction Steps

[1-(2-hydroxy-ethyl)-piperidin-4-yl]-carbamic acid tert-butyl ester (50 mg, 0.19 mmol, 1.0 eq) is added at room temperature to a stirred solution of 6-methoxy-[1,5]naphthyridin-3-ol (37 mg, 0.19 mmol, 1.0 eq) in tetrahydrofuran (5 mL), followed by triphenylphosphine polymer-bound (3 mmol/g, 193 mg, 0.58 mmol, 3.0 eq) and diisopropyl azodicarboxylate (115 μL, 0.58 mmol, 3.0 eq). After 3 hours stirring at room temperature, the polymer-bound is filtered off and washed successively with tetrahydrofuran (5 mL), dichloromethane (5 mL) and methanol (5 mL). The resulting solution is concentrated and the residue is extracted with ethyl acetate (3×10 mL) and water (10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a crude that is purified by column chromatography (silica gel, eluent: cyclohexane:ethyl acetate:methanol, 4:1:0 to 0:9:1, v/v/v) to afford {1-[2-(6-methoxy-[1,5]naphthyridin-3-yloxy)-ethyl]-piperidin-4-yl}-carbamic acid tert-butyl ester as an orange solid (35 mg, 33% yield).

Provenance & Evidence