(2,5-dioxopyrrolidin-1-yl) 2-acetyloxyacetate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A 3-neck round-bottom flask equipped with a mechanical stirrer, thermocouple and addition funnel with nitrogen inlet was charged with N-hydroxysuccinimide (commercially available from Sigma-Aldrich, St. Louis, Mo.) (211 g, 1.83 mol) and DCM (2.25 L) at room temperature, resulting in a suspension. Pyridine (178 mL, 2.2 mol) was added in one portion with no change in the internal temperature. A solution of acetoxyacetyl chloride (commercially available from Sigma-Aldrich, St. Louis, Mo.) (197 mL, 1.83 mol) in DCM (225 mL) was added dropwise over 60 minutes and the temperature rose to 35° C. Stirring was continued at room temperature for 2.5 hours. The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L). The organic layer was concentrated under vacuum and azeotroped with toluene (1×1 L) to obtain the product as a white solid (367 g, 93%). 1H NMR (400 MHz, CDCl3) δ 4.96 (2H, s), 2.86 (4H, s), 2.19 (3H, s) ppm; LCMS m/z: 238 (M+Na). A 3-neck round-bottom flask equipped with a mechanical stirrer thermocouple and addition funnel with nitrogen inlet rose to 35° C The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L) The organic layer was concentrated under vacuum azeotroped with toluene (1×1 L)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A 3-neck round-bottom flask equipped with a mechanical stirrer, thermocouple and addition funnel with nitrogen inlet was charged with N-hydroxysuccinimide (commercially available from Sigma-Aldrich, St. Louis, Mo.) (211 g, 1.83 mol) and DCM (2.25 L) at room temperature, resulting in a suspension. Pyridine (178 mL, 2.2 mol) was added in one portion with no change in the internal temperature. A solution of acetoxyacetyl chloride (commercially available from Sigma-Aldrich, St. Louis, Mo.) (197 mL, 1.83 mol) in DCM (225 mL) was added dropwise over 60 minutes and the temperature rose to 35° C. Stirring was continued at room temperature for 2.5 hours. The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L). The organic layer was concentrated under vacuum and azeotroped with toluene (1×1 L) to obtain the product as a white solid (367 g, 93%). 1H NMR (400 MHz, CDCl3) δ 4.96 (2H, s), 2.86 (4H, s), 2.19 (3H, s) ppm; LCMS m/z: 238 (M+Na). A 3-neck round-bottom flask equipped with a mechanical stirrer thermocouple and addition funnel with nitrogen inlet rose to 35° C The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L) The organic layer was concentrated under vacuum azeotroped with toluene (1×1 L)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A 3-neck round-bottom flask equipped with a mechanical stirrer, thermocouple and addition funnel with nitrogen inlet was charged with N-hydroxysuccinimide (commercially available from Sigma-Aldrich, St. Louis, Mo.) (211 g, 1.83 mol) and DCM (2.25 L) at room temperature, resulting in a suspension. Pyridine (178 mL, 2.2 mol) was added in one portion with no change in the internal temperature. A solution of acetoxyacetyl chloride (commercially available from Sigma-Aldrich, St. Louis, Mo.) (197 mL, 1.83 mol) in DCM (225 mL) was added dropwise over 60 minutes and the temperature rose to 35° C. Stirring was continued at room temperature for 2.5 hours. The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L). The organic layer was concentrated under vacuum and azeotroped with toluene (1×1 L) to obtain the product as a white solid (367 g, 93%). 1H NMR (400 MHz, CDCl3) δ 4.96 (2H, s), 2.86 (4H, s), 2.19 (3H, s) ppm; LCMS m/z: 238 (M+Na). A 3-neck round-bottom flask equipped with a mechanical stirrer thermocouple and addition funnel with nitrogen inlet rose to 35° C The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L) The organic layer was concentrated under vacuum azeotroped with toluene (1×1 L)

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A 3-neck round-bottom flask equipped with a mechanical stirrer, thermocouple and addition funnel with nitrogen inlet was charged with N-hydroxysuccinimide (commercially available from Sigma-Aldrich, St. Louis, Mo.) (211 g, 1.83 mol) and DCM (2.25 L) at room temperature, resulting in a suspension. Pyridine (178 mL, 2.2 mol) was added in one portion with no change in the internal temperature. A solution of acetoxyacetyl chloride (commercially available from Sigma-Aldrich, St. Louis, Mo.) (197 mL, 1.83 mol) in DCM (225 mL) was added dropwise over 60 minutes and the temperature rose to 35° C. Stirring was continued at room temperature for 2.5 hours. The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L). The organic layer was concentrated under vacuum and azeotroped with toluene (1×1 L) to obtain the product as a white solid (367 g, 93%). 1H NMR (400 MHz, CDCl3) δ 4.96 (2H, s), 2.86 (4H, s), 2.19 (3H, s) ppm; LCMS m/z: 238 (M+Na). A 3-neck round-bottom flask equipped with a mechanical stirrer thermocouple and addition funnel with nitrogen inlet rose to 35° C The reaction mixture was washed with water (1×1 L), 1N HCl (2×1 L) and brine (1×1 L) The organic layer was concentrated under vacuum azeotroped with toluene (1×1 L)