Potassium Carbonate → Sodium 2-(2-methoxycarbonyl-vinyl)benzenesulfonate

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A mixture of sodium 2-formylbenzenesulfonate hydrate (31) (tech., purity 75%; 1.33 g, 4.79 mmol), potassium carbonate (1.32 g, 9.56 mmol), and trimethyl phosphonoacetate (1.05 g, 5.77 mmol) in water (2.5 ml) was vigorously stirred at ambient temperature for 1 hour. The precipitate was filtered and carefully washed with methanol. The methanol extract was evaporated to give the title compound (0.66 g, 52%) as a white solid. 1H NMR (DMSO-d6, HMDSO), δ: 3.72 (3H, s); 6.43 (1H, d, J=16.0 Hz); 7.18–7.96 (4H, m); 8.83 (1H, d, J=16.0 Hz).

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