1-Pentyne → rac-5-{2-Hydroxy-3-[1-(2-fluoro-5-trifluoromethylphenyl)-cyclopropyl]-2-(pentin-1-yl)-propionylamino}phthalide

Participants

Reaction Conditions

Reaction Steps

A solution that consists of 1-pentyne (0.94 ml) in THF (9 ml) was mixed at −78° C. with nBuLi (0.6 ml, 1.6 M in hexane). It was allowed to stir for 30 minutes at −78° C., and then a solution of 5-{3-[1-(2-fluoro-5-trifluoromethylphenyl)-cyclopropyl]-2-oxopropionylamino}phthalide (200 mg) in 3 ml of tetrahydrofuran was added. Then, it was allowed to come to 23° C. over about 3 hours, and it was stirred for 10 more hours at this temperature. Then, the reaction mixture was poured into ice-cold, saturated ammonium chloride solution. It was extracted with ethyl acetate. The combined organic phases were washed with saturated sodium chloride solution and dried on sodium sulfate. The crude product was chromatographed on silica gel. 130 mg of product was obtained.

Provenance & Evidence