2-(Ethylthio)ethanol → Tert-butyl 3-[4-({4'-[2-(ethylthio)ethoxy]-2',6'-dimethylbiphenyl-3-yl}methoxy)phenyl]propanoate

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To a solution of tert-butyl 3-{4-[(4′-hydroxy-2′,6′-dimethylbiphenyl-3-yl)methoxy]phenyl}propanoate (1.69 g, 3.91 mmol), 2-(ethylthio)ethanol (0.46 mL, 4.30 mmol) and tributylphosphine (1.46 mL, 5.86 mmol) in tetrahydrofuran (33 mL) was added 1,1′-(azodicarbonyl)dipiperidine (1.48 g, 5.86 mmol) at room temperature with stirring. The reaction mixture was stirred at room temperature for 16 hrs., and an equivalent amount of the aforementioned reagents (2-(ethylthio)ethanol, tributylphosphine and 1,1′-(azodicarbonyl)dipiperidine) were added at the same temperature and the mixture was further stirred for 16 hrs. Diethyl ether was added to the reaction mixture and insoluble material was filtered off. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (hexane/ethyl acetate=10/1-hexane/ethyl acetate=4/1) to give the title compound (1.40 g, yield 69%) as a colorless oil.

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