4-bromo-3-oxo-N-phenylbutanamide

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

Procedure: Under a nitrogen atmosphere, sodium hydride (97%; 0.633 g, 25.61 mmol) was weighed into a dry reaction vessel and covered with 55 ml of anhydrous dioxane. A solution of phenyl isocyanate (1.39 ml, 12.81 mmol) in 5 ml of anhydrous dioxane was then added over a 5-10 minute period at room temperature (cooling with cold water). Next, the 4-bromoacetoacetanilide (3.28 g, 12.8 mmol) was added portionwise over a 20-minute period. The reaction mixture was stirred at 20°-25° C. for 5 hours, filtered under nitrogen atmosphere, and poured into 300 ml of ice-cold water. After acidifying (pH 5-6) with several drops of concentrated hydrochloric acid, the crude product was filtered off and crystallized from ethanol to provide 2.8 g. of amide product, m.p. 182°-184° C. filtered under nitrogen atmosphere poured into 300 ml of ice-cold water the crude product was filtered off crystallized from ethanol to provide 2.8 g

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

Procedure: Under a nitrogen atmosphere, a solution of bromine (1.16 ml, 22.59 mmol) in 17 ml of acetic acid containing a small crystal of iodine was added over 2.5 hours to a solution of acetoacetanilide (4.0 g, 22.57 mmol) in 12 ml of acetic acid, at room temperature (cooling with cold water). The reaction mixture was stirred at room temperature for 3 hours, then poured into 100 ml of ice-cold water and the crude solid product was filtered off. Following crystallization from ethanol, 3.30 g of 4-bromoacetoacetanilide were obtained, m.p 130°-132° C. the crude solid product was filtered off crystallization from ethanol

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

Procedure: Under a nitrogen atmosphere, sodium hydride (97%; 0.633 g, 25.61 mmol) was weighed into a dry reaction vessel and covered with 55 ml of anhydrous dioxane. A solution of phenyl isocyanate (1.39 ml, 12.81 mmol) in 5 ml of anhydrous dioxane was then added over a 5-10 minute period at room temperature (cooling with cold water). Next, the 4-bromoacetoacetanilide (3.28 g, 12.8 mmol) was added portionwise over a 20-minute period. The reaction mixture was stirred at 20°-25° C. for 5 hours, filtered under nitrogen atmosphere, and poured into 300 ml of ice-cold water. After acidifying (pH 5-6) with several drops of concentrated hydrochloric acid, the crude product was filtered off and crystallized from ethanol to provide 2.8 g. of amide product, m.p. 182°-184° C. filtered under nitrogen atmosphere poured into 300 ml of ice-cold water the crude product was filtered off crystallized from ethanol to provide 2.8 g

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

Procedure: Under a nitrogen atmosphere, a solution of bromine (1.16 ml, 22.59 mmol) in 17 ml of acetic acid containing a small crystal of iodine was added over 2.5 hours to a solution of acetoacetanilide (4.0 g, 22.57 mmol) in 12 ml of acetic acid, at room temperature (cooling with cold water). The reaction mixture was stirred at room temperature for 3 hours, then poured into 100 ml of ice-cold water and the crude solid product was filtered off. Following crystallization from ethanol, 3.30 g of 4-bromoacetoacetanilide were obtained, m.p 130°-132° C. the crude solid product was filtered off crystallization from ethanol

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

Procedure: Under a nitrogen atmosphere, sodium hydride (97%; 0.633 g, 25.61 mmol) was weighed into a dry reaction vessel and covered with 55 ml of anhydrous dioxane. A solution of phenyl isocyanate (1.39 ml, 12.81 mmol) in 5 ml of anhydrous dioxane was then added over a 5-10 minute period at room temperature (cooling with cold water). Next, the 4-bromoacetoacetanilide (3.28 g, 12.8 mmol) was added portionwise over a 20-minute period. The reaction mixture was stirred at 20°-25° C. for 5 hours, filtered under nitrogen atmosphere, and poured into 300 ml of ice-cold water. After acidifying (pH 5-6) with several drops of concentrated hydrochloric acid, the crude product was filtered off and crystallized from ethanol to provide 2.8 g. of amide product, m.p. 182°-184° C. filtered under nitrogen atmosphere poured into 300 ml of ice-cold water the crude product was filtered off crystallized from ethanol to provide 2.8 g

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

Procedure: Under a nitrogen atmosphere, a solution of bromine (1.16 ml, 22.59 mmol) in 17 ml of acetic acid containing a small crystal of iodine was added over 2.5 hours to a solution of acetoacetanilide (4.0 g, 22.57 mmol) in 12 ml of acetic acid, at room temperature (cooling with cold water). The reaction mixture was stirred at room temperature for 3 hours, then poured into 100 ml of ice-cold water and the crude solid product was filtered off. Following crystallization from ethanol, 3.30 g of 4-bromoacetoacetanilide were obtained, m.p 130°-132° C. the crude solid product was filtered off crystallization from ethanol