[CH2:1]([Li])CCC.[F:6][C:7]1[C:12]([CH:13]=O)=[C:11]([OH:15])[C:10]([O:16][CH3:17])=[CH:9][CH:8]=1.Cl.C(OCC)(=O)C>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.C1(C)C=CC=CC=1>[F:6][C:7]1[C:12]([CH:13]=[CH2:1])=[C:11]([OH:15])[C:10]([O:16][CH3:17])=[CH:9][CH:8]=1To a suspension of 50 g of methyltriphenylphosphonium bromide in 300 ml of toluene there was added dropwise 45 ml of n-butyllithium (2.55 M, hexane solution) at 0° C. under a nitrogen atmosphere. The mixture was stirred at room temperature for 2 hours and allowed to stand. Next, 150 ml of the supernatant was added to a solution of 5 g of 6-fluoro-2-hydroxy-3-methoxybenzaldehyde [CAS No. 457628-15-8] in 90 ml of toluene. The mixture was stirred at room temperature for 1 hour, 1N hydrochloric acid was added to the reaction mixture, and extraction was performed with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and filtered, and the filtrate was concentrated. The residue was purified by silica gel column chromatography (ethyl acetate-heptane) to give 3-fluoro-6-methoxy-2-vinylphenol (4.33 g).
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