[F:1][C:2]([C:5]1[CH:6]=[C:7]([CH2:11][OH:12])[CH:8]=[CH:9][CH:10]=1)([F:4])[CH3:3].C(OCC)C.C(=O)(O)[O-].[Na+].S([O-])([O-])(=O)=S.[Na+].[Na+]>ClCCl>[F:1][C:2]([C:5]1[CH:6]=[C:7]([CH:8]=[CH:9][CH:10]=1)[CH:11]=[O:12])([F:4])[CH3:3]
Add a solution of [3-(1,1-Difluoro-ethyl)-phenyl]-methanol (3.47 mmol) in dichloromethane (10.5 mL) dropwise to a suspension of 3,3,3-triacetoxy-3-iodophthalide (3.64 mmol) in dichloromethane (10.5 mL) at room temperature. Stir for 30 minutes. Add diethyl ether (10 mL) and 5% aqueous sodium bicarbonate (10 mL) containing sodium thiosulfate (3 g). Mix well for 20 minutes. Separate the layers, and extract the aqueous with ethyl ether. Combine the organic layers, wash with brine, dry over sodium sulfate, filter, and evaporate to give a yellow solid. Purify over silica (40 g) eluting with 0 to 50% dichloromethane in hexanes. Evaporate until most solvent is removed being careful not to drive off the volatile product. Dry additionally by blowing a nitrogen stream over the product to give the title compound in 70% yield. 1HNMR (400.43 MHz, CDCl3): δ 10.03 (s, 1H), 8.00 (s, 1H), 7.92 (d, J=7.5 Hz, 1H), 7.75 (d, J=7.0 Hz, 1H), 7.59 (t, J=7.7 Hz, 1H), 1.98-1.89 (m, 3H).
Wird geladen…
