ethyl 2-(2-oxopyrrolidin-1-yl)acetate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: The same procedure of Example 25, starting from ethyl 2-oxo-1-pyrrolidineacetate and 1-(D,L-alanyl)-2,2-dimethyl-4-imidazolidinone, afforded the title compound, m.p. 198°-200° C. (2-propanol).

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

Procedure: The same procedure of Example 25, starting from ethyl 2-oxo-1-pyrrolidineacetate and 1-(D,L-alanyl)-2,2-dimethyl-4-imidazolidinone, afforded the title compound, m.p. 198°-200° C. (2-propanol).

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of ethyl 2-oxo-1-pyrrolidineacetate (7 g) and 1-(2-aminoacetyl)-2-isopropyl-4-imidazolidinone (4 g) was heated at 110° C. for 8 hours. After cooling the oily residue was chromatographed on a silica gel column (eluant dichloromethane/methanol 9:1). The selected fractions were collected, evaporated under vacuum and the residue was triturated with diisopropyl ether to yield 2.6 g of the title compound, m.p. 104°-106° C. Mass spectrum (E.I., 70 eV, 1.5 mA), m/z=310 (M.+), 267 (M.+ --C3H7). After cooling the oily residue was chromatographed on a silica gel column (eluant dichloromethane/methanol 9:1) The selected fractions were collected evaporated under vacuum the residue was triturated with diisopropyl ether