[CH:1]([C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=[O:8])=[CH:5][CH:4]=1)=O.C([O-])([O-])=O.[K+].[K+].[CH3:18][O:19][C:20]([CH2:22]P(OC)(OC)=O)=[O:21]>O>[CH3:18][O:19][C:20](=[O:21])/[CH:22]=[CH:1]/[C:3]1[CH:11]=[CH:10][C:6]([C:7]([OH:9])=[O:8])=[CH:5][CH:4]=14-Formylbenzoic acid (20 g, 0.133 mol) and K2CO3 (55 g, 0.398 mol) were added to water (350 mL) and cooled to 0-5° C. Trimethyl phosphonoacetate (26 mL, 0.160 mol) was charged dropwise maintaining the reaction temperature below 15° C. The reaction was then warmed and stirred at RT for 1.5 h before acidifying to pH˜1. The resulting precipitate was filtered and dried in vacuo to afford the title product as a pale yellow solid (29.5 g, quant). 1H NMR (300 MHz, d6-DMSO) δ: 7.89-7.52 (5H, m), 6.59 (1H, d, J=16.2 Hz), 3.7 (3H, s).
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