Acetic Acid → {2-Ethyl-4-[({2-methyl-5-[4-(trifluoromethyl)phenyl]-3-furyl}methyl)thio]phenoxy}acetic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a mixture of zinc (407 mg) in ethyl acetate (10 ml) stirred at 60° C. was added acetic acid (0.203 ml) followed by a solution of ethyl[4-(chlorosulfonyl)-2-ethylphenoxy]acetate (intermediate 111, 546 mg) in ethyl acetate. The reaction mixture was stirred 60° C. for 2 hours and then dichlorodimethylsilane (0.431 ml) was added drop-wise. After a further 90 minutes {2-methyl-5-[4-(trifluoromethyl)phenyl]-3-furyl}methanol (472 mg) was added and the reaction mixture stirred at reflux for 17 hours. The reaction mixture was diluted with ethyl acetate; extracted with water, saturated aqueous sodium bicarbonate, water and dried with brine and over sodium sulfate. An attempt was purify the crude material by Biotage® chromatography using 3:2 petroleum ether: ethyl acetate as eluent. The partially purified material (223 mg) was hydrolyzed in 1,4-dioxan (6 ml) using 0.5 M aqueous sodium hydroxide (1.86 ml) for 16 hours. The reaction mixture was neutralized with 50W×2-200 Dowex; evaporated and the residue purified by mass-directed autopreparative HPLC to give the title compound as a solid.

Herkunft & Nachweise