ethyl 3-[(3-ethoxy-3-oxopropyl)amino]propanoate

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

Procedure: A 11 g quantity (0.05 mole) of 2,3-dihydro-2,2-dimethylbenzofuran-7-yl N-methyl-carbamate was dissolved in 70 ml of methylene chloride, 5.2 g (0.05 mole) of sulfur dichloride was added to the solution with cooling, and 5 g (0.05 mole) of triethylamine was further added dropwise to the solution at -10° to -5° C. The mixture was stirred at 0° C. for one hour and further at room temperature for 2 hours. After cooling to -10° to -5° C., 10.9 g (0.05 mole) of diethyl iminodipropionate was added dropwise to the mixture, and 5 g (0.05 mole) of triethylamine was further added dropwise to the mixture. The resulting mixture was stirred at 0° C. for 2 hours and thereafter allowed to stand overnight at room temperature. With addition of 100 ml of methylene chloride, the reaction mixture was washed with 100 ml of water three times. The methylene chloride layer was dried and then concentrated in a vacuum to give an oily product, which was almost entirely composed of the desired product although containing small amounts of impurities. Yield: 16.9 g (72.2%). with cooling After cooling to -10° to -5° C. was further added dropwise to the mixture The resulting mixture was stirred at 0° C. for 2 hours to stand overnight at room temperature the reaction mixture was washed with 100 ml of water three times The methylene chloride layer was dried concentrated in a vacuum to give an oily product, which