1-O-ethyl 3-O-methyl 2-methoxypropanedioate

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The NaOCH3 (7.8 g, 3 eq) was added to a stirred solution of 1-ethyl 3-methyl 2-methoxymalonate (11 g, 1.3 eq), 4-nitrobenzimidamide hydrochloride (9.6 g, 1 eq) and EtOH (240 ml) and the mixture was refluxed for 8 hrs. After 8 hrs, the solvent was evaporated and water (10˜15 ml) was added to the mixture then the mixture was cooled to 0° C. and carefully acidified with conc. HCl. After overnight cooling, it led to the formation of brown precipitates. The mixture was filtered and the precipitates was dried in vacuo to give a brown solid (65%) as a product. the mixture was refluxed for 8 hrs the solvent was evaporated water (10˜15 ml) was added to the mixture After overnight cooling The mixture was filtered the precipitates was dried in vacuo

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The NaOCH3 (7.8 g, 3 eq) was added to a stirred solution of 1-ethyl 3-methyl 2-methoxymalonate (11 g, 1.3 eq), 4-nitrobenzimidamide hydrochloride (9.6 g, 1 eq) and EtOH (240 ml) and the mixture was refluxed for 8 hrs. After 8 hrs, the solvent was evaporated and water (10˜15 ml) was added to the mixture then the mixture was cooled to 0° C. and carefully acidified with conc. HCl. After overnight cooling, it led to the formation of brown precipitates. The mixture was filtered and the precipitates was dried in vacuo to give a brown solid (65%) as a product. the mixture was refluxed for 8 hrs the solvent was evaporated water (10˜15 ml) was added to the mixture After overnight cooling The mixture was filtered the precipitates was dried in vacuo

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The NaOCH3 (7.8 g, 3 eq) was added to a stirred solution of 1-ethyl 3-methyl 2-methoxymalonate (11 g, 1.3 eq), 4-nitrobenzimidamide hydrochloride (9.6 g, 1 eq) and EtOH (240 ml) and the mixture was refluxed for 8 hrs. After 8 hrs, the solvent was evaporated and water (10˜15 ml) was added to the mixture then the mixture was cooled to 0° C. and carefully acidified with conc. HCl. After overnight cooling, it led to the formation of brown precipitates. The mixture was filtered and the precipitates was dried in vacuo to give a brown solid (65%) as a product. the mixture was refluxed for 8 hrs the solvent was evaporated water (10˜15 ml) was added to the mixture After overnight cooling The mixture was filtered the precipitates was dried in vacuo