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A 500-mL round bottomed flask was charged with 3-chlorobenzimidamide (5.75 g, 30.1 mmol), ethyl 3-cyclopropyl-3-oxopropanoate (5.00 g, 32.0 mmol), and ethanol (100 mL) and the mixture cooled to 0° C. To the stirred mixture was added 25% sodium methoxide in methanol (15.0 mL, 64.0 mmol). The resulting mixture was stirred at reflux for 20 h. After cooling to room temperature, the mixture was evaporated under reduced pressure to 25 mL. The residual slurry was cautiously treated with 2N HCl (50 mL) forming a solid. The solid was collected by filtration and washed with water followed by ether to afford the title compound (2.46 g, 31%) as a white solid, which was carried forward into the next step without further purification. MW=246.69. 1H NMR (DMSO-d6, 500 MHz) δ 12.55 (s, 1H), 8.13 (s, 1H), 8.06 (d, J=7.5 Hz, 1H), 7.64-7.60 (m, 1H), 7.54 (t, J=8.0 Hz, 1H), 6.34 (s, 1H), 2.00-1.93 (m, 1H), 1.08-1.02 (m, 2H), 0.99-0.91 (m, 2H).

1. temperatureat reflux for 20 h
2. temperatureAfter cooling to room temperature
3. customthe mixture was evaporated under reduced pressure to 25 mL
4. additionThe residual slurry was cautiously treated with 2N HCl (50 mL)
5. customforming a solid
6. filtrationThe solid was collected by filtration
7. washwashed with water