Triphenylphosphine → methyl (RS)-5-[3-(3-methyl-2-thienylmethoxy)phenyl]-4-(2-methylphenyl)-5-oxopentanoate

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A solution of triphenylphosphine (1.13 g) in tetrahydrofuran (30 mL) is treated with diisopropyl azodicarboxylate (0.84 mL) at 0-5° C. The suspension is then treated with methyl (RS)-5-(3-hydroxyphenyl)-5-oxo-4-(2-methylphenyl)pentanoate (671 mg) and 3-methyl-2-thienylmethanol (275 mg), and stirred at 5° C. for 15 minutes. The solution is evaporated and the residue is subjected to flash chromatography on silica gel, eluting with a mixture of pentane and ethyl acetate (5:1 v/v), to give methyl (RS)-5-[3-(3-methyl-2-thienylmethoxy)phenyl]-4-(2-methylphenyl)-5-oxopentanoate (350 mg), in the form of an oil. [NMR(CDCl3):- 2.0-2.5(4H,m), 2.25(3H,s),2.5(3H,s), 3.65(3H,s), 4.8(1H,m),5.1 (2H,q),6.85-7.5(10H)].

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