[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([OH:11])=[O:10])=[CH:4][CH:3]=1.[CH:12]([C:14]1[CH:19]=[CH:18][C:17](/[CH:20]=[CH:21]/[C:22]([O:24][CH3:25])=[O:23])=[CH:16][CH:15]=1)=O.C(OC(=O)C)(=O)C.C(N(C(C)C)CC)(C)C.Cl>C(OCC)(=O)C.O>[F:1][C:2]1[CH:3]=[CH:4][C:5]([C:8](=[CH:12][C:14]2[CH:15]=[CH:16][C:17](/[CH:20]=[CH:21]/[C:22]([O:24][CH3:25])=[O:23])=[CH:18][CH:19]=2)[C:9]([OH:11])=[O:10])=[CH:6][CH:7]=1A mixture of 4-fluorophenylacetic acid (2.5 g, 13.2 mmol) and methyl (E)-3-(4-formylphenyl)acrylate (2.03 g, 13.2 mmol) were dissolved under stirring with acetic anhydride (8 mL). To this mixture, diisopropylethylamine (DIPEA) (3.4 mL, 19.7 mmol) was added and stirred at 30° C. for 2 hours. Upon completion (as monitored by TLC using 100% ethyl acetate as eluent), the reaction mixture was poured into water and the pH adjusted to 1 using dilute HCl (1:1). The aqueous layer was extracted with ethyl acetate (2×150 mL). The combined ethyl acetate layer was washed with water till the washings were neutral and dried over anhydrous Na2SO4. The ethyl acetate layer was evaporated to dryness to obtain a sticky compound and further triturated with cold dichloromethane (DCM) to furnish a white solid. The solid obtained was filtered and dried under vacuum to afford the title compound (2 g, 47% yield).
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