Tributylphosphine → {2-Chloro-4-[3-(4-chloro-phenylethynyl)-5-(3-piperidin-1-yl-propoxy)-phenylsulfanyl]-phenoxy}-acetic Acid Ethyl Ester

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Reaction Steps

[{2-Chloro-4-[3-(4-chloro-phenylethynyl)-5-hydroxy-phenylsulfanyl]-phenoxy}-acetic acid ethyl ester (0.4 g; 0.85 mmol), 3-piperidin-1-yl-propan-1-ol (0.12 g; 0.85 mmol) and tributylphosphine (0.37 mL; 1.5 mmol) were dissolved in THF (50 mL) in a dried reaction flask under an atmosphere of nitrogen. 1,1′-(Azodicarbonyl)dipiperidine (0.38 g; 1.5 mmol) dissolved in THF (25 mL) was added to the reaction mixture, which was stirred at room temperature for 16 h. The reaction mixture was evaporated to dryness and 5% aqueous citric acid and ethyl acetate was added. The organic phase was separated, dried, evaporated to dryness, and purified by prep HPLC (method A). Yield: 275 mg. HPLC-MS: m/z: 598.0 (M+); Rt: 2.3 min.

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