[F:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=O)=[CH:4][C:3]=1[O:10][CH3:11].C(O)(=O)[CH2:13][C:14]([OH:16])=[O:15].N1CCCCC1.Cl>N1C=CC=CC=1.O>[F:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[CH:13][C:14]([OH:16])=[O:15])=[CH:4][C:3]=1[O:10][CH3:11]To a solution of 4-fluoro-3-methoxybenzaldehyde (32 g, 0.2 mol) in pyridine (100 mL) was added malonic acid (43 g, 0.4 mol) and piperidine (3 mL, 0.03 mol). The reaction solution was stirred at 85° C. for 13 hr. Upon cooling, the resulting suspension was added to cold water (500 mL) and acidified with conc. HCl (80 mL). The white solid was filtered off, washed with water and dried to yield 36 g (92%) of 3-(4-fluoro-3-methoxyphenyl)-acrylic acid. RP-HPLC: 3.71 min. 1H-NMR (DMSO-d6) δ (ppm) 3.85 (s, 3), 6.53 (d, 1, J=16), 7.20 (m, 2), 7.50 (m, 1), 7.52 (d, 1, J=16).
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