Tributylphosphine → (Z)-(S)-2-ethoxy-3-[4-(3-methyl-5-phenyl-pent-2-en-4-ynyloxy)-phenyl]-propionic acid ethyl ester

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Reaction Steps

1,1′-(azodicarbonyl) dipiperidine (0.504 g, 2.0 mmol) was added at 0° C. to a stirred solution of tributylphosphine (0.493 mL, 2.0 mmol), (Z)-3-methyl-5-phenyl-pent-2-en-4-yn-1-ol (0.172 g, 1.0 mmol) (J. Org. Chem. 1999, 64 (21), 7687–7692), and (S)-ethyl 2-ethoxy-3-(4-hydroxy-phenyl)-propionate (0.262 g, 1.1 mmol) in dry benzene (20 mL), the mixture allowed to warm to room temperature, and stirring continued for 24 h. The resulting mixture was evaporated in vacuo, and the residue purified by flash column chromatography on silica gel (20% ethyl acetate in n-heptane eluent) to give (Z)-(S)-2-ethoxy-3-[4-(3-methyl-5-phenyl-pent-2-en-4-ynyloxy)-phenyl]-propionic acid ethyl ester as an oil; 0.267 g (68%).

Provenance & Evidence