Thiophene → Methyl 5,5-dimethyl-5,6-dihydro-8-(2-thienyl)-2-naphthalenecarboxylate

関与物質

反応条件

反応手順

(Compound E5) To a solution of 329.0 mg (3.93 mmol) of thiophene in 2.0 mL THF at 0° C. was added 251.8 mg (3.93 mmol, 1.56 mL of 2.5M solution in hexanes) of n-butyllithium. After stirring for 3 h at 0° C., a solution of 845.0 mg (6.28 mmol) of ZnCl2 in 5.0 mL THF was added and the resulting solution stirred for 30 minutes. This solution was added to a second flask containing 570.0 mg (1.57 mmol) of methyl 5,5-dimethyl-5,6-dihydro-8-(trifluoromethylsulfonyl)oxy-naphthalene-2-carboxylate (Compound E4) and 76.0 mg (0.063 mmol) of tetrakis(triphenyphosphine)palladium(0) in 4.0 mL THF, and the resulting solution was heated to 50° C. for 3 h. Upon cooling to room temperature the reaction was quenched by the addition of saturated aqueous NH4Cl. Extraction with EtOAc was followed by washing of the combined organic layers with H2O and saturated aqueous NaCl, and drying over MgSO4. The dry solution was concentrated under reduced pressure and the title compound was isolated from the residue as a yellow oil by column chromatography (5-10% EtOAc/hexanes).

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