1-prop-2-ynylimidazolidine-2,4-dione

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2.0 g of N-propargyl-N-methoxycarbonylglycinamide were added to the mixture of 5 ml of methanol and 2.5 ml of 20% aqueous solution of sodium hydroxide and maintained at 70° C. for an hour. After cooled down to room temperature; the reaction mixture was neutralized with concentrated hydrochloric acid followed by concentrating and drying the same by an evaporation under reduced pressure. Then it was extracted with acetonitrile and sodium chloride was removed off from the extract by filtration. The solvent was evaporated off from the filtrate to obtain 1.4 g of 1-propargyl-2,4-dioxoimidazolidine (melting point: 124°-125° C.). After cooled down to room temperature by concentrating drying the same by an evaporation under reduced pressure Then it was extracted with acetonitrile and sodium chloride was removed off from the extract by filtration The solvent was evaporated off from the filtrate

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

Procedure: 3.0 g of methyl N-propargyl-N-methoxycarbonylglycinate were dissolved in 40 ml of 28% aqueous ammonia. Then the mixture was maintained under the pressure of 10-13 kg/cm2 at 100°-110° C. for an hour. Then the solvent was evaporated off from the reaction mixture. The resulting mixture was subjected to a column chromatography on silica gel (5:1 ethyl acetate:methanol as eluent) to obtain 0.65 g of 1-propargyl-2,4-dioxoimidazolidine. Then the mixture was maintained under the pressure of 10-13 kg/cm2 at 100°-110° C. for an hour Then the solvent was evaporated off from the reaction mixture