ethyl 2-[(2-butoxy-2-oxoethyl)amino]-2-oxoacetate

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

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

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of butyl N-[ethoxy(oxo)acetyl]glycinate (783 g, 3.38 mol) in acetonitrile (8 L) in a 50 L glass reactor with overhead stirrer, phosphorus pentoxide (415 g, 2.92 mol) was added in portions. The reaction was heated at 60° C. for 1 hour. The product mixture was cooled, and water (8 L) was added with the mixture maintained at 20° C. The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L). The organic extracts were combined, washed twice with saturated aqueous sodium bicarbonate (8 L total), dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with 0-30% heptane/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled maintained at 20° C The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L) washed twice with saturated aqueous sodium bicarbonate (8 L total) dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-butoxy-2-oxoethanaminium chloride (573.5 g, 3.42 mol), triethylamine (415 g, 4.1 mol), and diethyl oxalate (1.0 kg, 6.8 mol) in ethanol (7 L) was heated at 50° C. for 3 hours. The product mixture was cooled and concentrated under vacuum. The residue was dissolved in methylene chloride and washed with two 4 L portions of water. The organic fraction was dried over anhydrous magnesium sulfate, filtered, and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with heptane/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled concentrated under vacuum The residue was dissolved in methylene chloride washed with two 4 L portions of water The organic fraction was dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

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

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

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of butyl N-[ethoxy(oxo)acetyl]glycinate (783 g, 3.38 mol) in acetonitrile (8 L) in a 50 L glass reactor with overhead stirrer, phosphorus pentoxide (415 g, 2.92 mol) was added in portions. The reaction was heated at 60° C. for 1 hour. The product mixture was cooled, and water (8 L) was added with the mixture maintained at 20° C. The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L). The organic extracts were combined, washed twice with saturated aqueous sodium bicarbonate (8 L total), dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with 0-30% heptane/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled maintained at 20° C The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L) washed twice with saturated aqueous sodium bicarbonate (8 L total) dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-butoxy-2-oxoethanaminium chloride (573.5 g, 3.42 mol), triethylamine (415 g, 4.1 mol), and diethyl oxalate (1.0 kg, 6.8 mol) in ethanol (7 L) was heated at 50° C. for 3 hours. The product mixture was cooled and concentrated under vacuum. The residue was dissolved in methylene chloride and washed with two 4 L portions of water. The organic fraction was dried over anhydrous magnesium sulfate, filtered, and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with heptane/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled concentrated under vacuum The residue was dissolved in methylene chloride washed with two 4 L portions of water The organic fraction was dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of butyl N-[ethoxy(oxo)acetyl]glycinate (783 g, 3.38 mol) in acetonitrile (8 L) in a 50 L glass reactor with overhead stirrer, phosphorus pentoxide (415 g, 2.92 mol) was added in portions. The reaction was heated at 60° C. for 1 hour. The product mixture was cooled, and water (8 L) was added with the mixture maintained at 20° C. The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L). The organic extracts were combined, washed twice with saturated aqueous sodium bicarbonate (8 L total), dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with 0-30% heptanes/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled maintained at 20° C The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L) washed twice with saturated aqueous sodium bicarbonate (8 L total) dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-butoxy-2-oxoethanaminium chloride (573.5 g, 3.42 mol), triethylamine (415 g, 4.1 mol), and diethyl oxalate (1.0 kg, 6.8 mol) in ethanol (7 L) was heated at 50° C. for 3 hours. The product mixture was cooled and concentrated under vacuum. The residue was dissolved in methylene chloride and washed with two 4 L portions of water. The organic fraction was dried over anhydrous magnesium sulfate, filtered, and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with heptanes/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled concentrated under vacuum The residue was dissolved in methylene chloride washed with two 4 L portions of water The organic fraction was dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-butoxy-2-oxoethanaminium chloride (573.5 g, 3.42 mol), triethylamine (415 g, 4.1 mol), and diethyl oxalate (1.0 kg, 6.8 mol) in ethanol (7 L) was heated at 50° C. for 3 hours. The product mixture was cooled and concentrated under vacuum. The residue was dissolved in methylene chloride and washed with two 4 L portions of water. The organic fraction was dried over anhydrous magnesium sulfate, filtered, and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with heptanes/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled concentrated under vacuum The residue was dissolved in methylene chloride washed with two 4 L portions of water The organic fraction was dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of butyl N-[ethoxy(oxo)acetyl]glycinate (783 g, 3.38 mol) in acetonitrile (8 L) in a 50 L glass reactor with overhead stirrer, phosphorus pentoxide (415 g, 2.92 mol) was added in portions. The reaction was heated at 60° C. for 1 hour. The product mixture was cooled, and water (8 L) was added with the mixture maintained at 20° C. The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L). The organic extracts were combined, washed twice with saturated aqueous sodium bicarbonate (8 L total), dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum. The residual oil was subjected to column chromatography on silica gel eluting with O-30% heptane/ethyl acetate gradient. Collection and concentration of appropriate fractions provided the title material. The product mixture was cooled maintained at 20° C The resultant mixture was extracted with dichloromethane (8 L, and 3 times 2 L) washed twice with saturated aqueous sodium bicarbonate (8 L total) dried over anhydrous magnesium sulfate filtered concentrated under vacuum Collection and concentration of appropriate fractions