2-ethoxy-2-oxoethanesulfonic acid

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

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

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2.21 g (15.8 mmol) of sulfoacetic acid was suspended in 30 ml of ethanol, and the suspension was heated at 80° C. under reflux for 5 hours. The solvent was distilled off to obtain the title compound. under reflux for 5 hours The solvent was distilled off

Conditions: temp:125.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (ethoxycarbonyl)methanesulfonic acid (10 g, 60 mmol.) and POCl3 (45 mL) was heated at 125° C. for 5 h. The mixture was cooled and filtered, and excess POCl3 was removed to give crude (ethoxycarbonyl)methanesulfonyl chloride (8.1 g, 80%) used directly without purification. The mixture was cooled filtered excess POCl3 was removed

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

Procedure: To a solution of Na2SO3 (10 g, 79 mmol.) in 50 mL of H2O was added a solution of ethyl 2-chloroacetate (12.7 mL, 119 mmol.) in 55 mL of EtOH. The mixture was heated at reflux for 6 h, after which time all the volatiles were removed by evaporation under reduced pressure. The concentrated materials were dried to afford crude (ethoxycarbonyl)methanesulfonic acid (13.3 g, 100%) used directly without purification. The mixture was heated at reflux for 6 h after which time all the volatiles were removed by evaporation under reduced pressure The concentrated materials were dried

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

Procedure: To a solution of Na2SO3 (10 g, 79 mmol.) in 50 mL of H2O was added a solution of ethyl 2-chloroacetate (12.7 mL, 119 mmol.) in 55 mL of EtOH. The mixture was heated at reflux for 6 h, after which time all the volatiles were removed by evaporation under reduced pressure. The concentrated materials were dried to afford crude (ethoxycarbonyl)methanesulfonic acid (13.3 g, 100%) used directly without purification. The mixture was heated at reflux for 6 h after which time all the volatiles were removed by evaporation under reduced pressure The concentrated materials were dried

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: 1H NMR (CDCl3):δ1.35 (t, 3H), 4.1 (s, 2H), 4.25 (q, 2H). Amixture of ethyl sulfoacetate (16.82 g, 100 mM) and POCl3 (30.67 g, 200 mM) was heated at 125° C. for 5 hours. The mixture was cooled and filtered, and excess POCl3 was removed to give ethyl chlorosulfonylacetate. The ethyl chlorosulfonylacetate (8.18 g, 43.83 mM) was added dropwise with stirring to a solution of 2,6-diisopropylaniline (15.54 g, 87.66 mM) in 50 mL CH2Cl2 maintained at 0° C. The mixture was stirred at room temperature for an additional 18 hours. The solvent was removed and the residue was redissolved in 100 mL ethyl acetate and washed with 1N HCl and brine. The ethyl acetate was evaporatedand the pure compound was isolated by chromatography over silica gel (EtOAc/hexane, 1:4 as eluant) as a white powder identified as ethyl (2,6-diisopropylphenylsulfamoyl)acetate, 7.0 g (≈50%), mp 74°-77° C. The mixture was cooled filtered excess POCl3 was removed

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

Procedure: 1H NMR (CDCl3):δ1.35 (t, 3H), 4.1 (s, 2H), 4.25 (q, 2H). Amixture of ethyl sulfoacetate (16.82 g, 100 mM) and POCl3 (30.67 g, 200 mM) was heated at 125° C. for 5 hours. The mixture was cooled and filtered, and excess POCl3 was removed to give ethyl chlorosulfonylacetate. The ethyl chlorosulfonylacetate (8.18 g, 43.83 mM) was added dropwise with stirring to a solution of 2,6-diisopropylaniline (15.54 g, 87.66 mM) in 50 mL CH2Cl2 maintained at 0° C. The mixture was stirred at room temperature for an additional 18 hours. The solvent was removed and the residue was redissolved in 100 mL ethyl acetate and washed with 1N HCl and brine. The ethyl acetate was evaporatedand the pure compound was isolated by chromatography over silica gel (EtOAc/hexane, 1:4 as eluant) as a white powder identified as ethyl (2,6-diisopropylphenylsulfamoyl)acetate, 7.0 g (≈50%), mp 74°-77° C. The mixture was cooled filtered excess POCl3 was removed

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

Procedure: 1H NMR (CDCl3):δ1.35 (t, 3H), 4.1 (s, 2H), 4.25 (q, 2H). Amixture of ethyl sulfoacetate (16.82 g, 100 mM) and POCl3 (30.67 g, 200 mM) was heated at 125° C. for 5 hours. The mixture was cooled and filtered, and excess POCl3 was removed to give ethyl chlorosulfonylacetate. The ethyl chlorosulfonylacetate (8.18 g, 43.83 mM) was added dropwise with stirring to a solution of 2,6-diisopropylaniline (15.54 g, 87.66 mM) in 50 mL CH2Cl2 maintained at 0° C. The mixture was stirred at room temperature for an additional 18 hours. The solvent was removed and the residue was redissolved in 100 mL ethyl acetate and washed with 1N HCl and brine. The ethyl acetate was evaporatedand the pure compound was isolated by chromatography over silica gel (EtOAc/hexane, 1:4 as eluant) as a white powder identified as ethyl (2,6-diisopropylphenylsulfamoyl)acetate, 7.0 g (≈50%), mp 74°-77° C. The mixture was cooled filtered excess POCl3 was removed

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

Procedure: Sulfoacetic acid (52 g, 371 mM) and EtOH (500 mL) were heated under reflux for 20 hours. The reaction mixture was cooled, and the excess ethanol was removed under vacuum to give ethyl sulfoacetate. under reflux for 20 hours The reaction mixture was cooled the excess ethanol was removed under vacuum