[CH:1]1([CH:6]([OH:9])[CH:7]=[CH2:8])[CH2:5][CH2:4][CH2:3][CH2:2]1.[F:10][C:11]1[CH:16]=[C:15](Br)[CH:14]=[CH:13][C:12]=1[CH:18]([F:20])[F:19].C([O-])(O)=O.[Na+].O>CN1C(=O)CCC1>[CH:1]1([C:6](=[O:9])[CH2:7][CH2:8][C:15]2[CH:14]=[CH:13][C:12]([CH:18]([F:20])[F:19])=[C:11]([F:10])[CH:16]=2)[CH2:5][CH2:4][CH2:3][CH2:2]1
A mixture of 1-cyclopentyl-2-propen-1-ol (34 g, 0.266 mol), 2-fluoro-4-bromo-difluoromethyl benzene, (40 g, 0.177 mol, 1.5 equiv), and NaHCO3 (17.8 g, 0.212 mol, 1.2 equiv) in anhydrous NMP (200 mL) was heated to 140° C. for 1 h, resulting in complete conversion by TLC. The reaction mixture was poured into water and extracted with CH2Cl2. The organic layer was separated, washed with brine and dried over anhydrous Na2SO4. After the removal of the solvent, the residue was purified by column chromatography using hexanes/ethyl acetate, and the product-containing fractions combined and concentrated. The residue was fractionally distilled through a Vigreux column to give 16 g (33%) of the desired product (bp 100° C./0.2 Torr).
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