benzenecarbothiohydrazide

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: Add a solution of thiobenzoylsulfanylacetic acid methyl ester (1.9 g, 8.4 mmol) in ethanol (30 mL) to a solution of anhydrous hydrazine (1 mL) at room temperature under nitrogen and stir for 2 hours. Then add water (20 mL) and remove the solvent under reduced pressure. Dissolve the residue in ethyl acetate (300 mL), wash with water (200 mL) and brine (200 mL), and dry over magnesium sulfate. Remove the solvent under reduced pressure to provide thiobenzoic acid hydrazide (1.2 g, 94%). Then add water (20 mL) and remove the solvent under reduced pressure Dissolve the residue in ethyl acetate (300 mL) wash with water (200 mL) and brine (200 mL) dry over magnesium sulfate Remove the solvent under reduced pressure

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

Procedure: Add a solution of thiobenzoylsulfanylacetic acid methyl ester (1.9 g, 8.4 mmol) in ethanol (30 mL) to a solution of anhydrous hydrazine (1 mL) at room temperature under nitrogen and stir for 2 hours. Then add water (20 mL) and remove the solvent under reduced pressure. Dissolve the residue in ethyl acetate (300 mL), wash with water (200 mL) and brine (200 mL), and dry over magnesium sulfate. Remove the solvent under reduced pressure to provide thiobenzoic acid hydrazide (1.2 g, 94%). Then add water (20 mL) and remove the solvent under reduced pressure Dissolve the residue in ethyl acetate (300 mL) wash with water (200 mL) and brine (200 mL) dry over magnesium sulfate Remove the solvent under reduced pressure

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

Procedure: To a solution of thiobenzhydrazide (3.7 g, 24.34 mmole) in methylene chloride (50 ml), equipped with magnetic stirrer, nitrogen inlet, and an outlet connected to a trap containing a diluted NAOH solution, was added trichloromethyl chloroformate (4 g, 20.2 mmole). The reaction mixture was stirred at room temperature for one hour. The mixture was diluted with methylene chloride (100 ml) and washed with water (3×50 ml) and brine. The organic layer was dried over MgSO4. After the drying agent was filtered off the filtrate was concentrated to a residue. The residue was triturated with hexane and the solid product was collected by suction-filtration to give 3.7 g as a powder. m.p.=140°-143° C. connected to a trap containing a diluted NAOH solution washed with water (3×50 ml) and brine The organic layer was dried over MgSO4 After the drying agent was filtered off the filtrate was concentrated to a residue The residue was triturated with hexane the solid product was collected by suction-filtration to give 3.7 g as a powder

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: 3-amino-6-bromo-pyrazine-2-carboxylic acid (1.000 g, 4.588 mmol) and benzenecarbothiohydrazide (759.1 mg, 4.588 mmol) were suspended in acetonitrile (25.00 mL), cooled in an ice bath and then treated with dibromo-triphenyl-phosphorane (4.453 g, 10.55 mmol) The reaction mixture was allowed to stir in an ice bath for 2 hours and then DIPEA (1.778 g, 2.396 mL, 13.76 mmol) was added slowly at 10° C. The reaction was left to stir at 0-10° C. for a further hour and the resultant precipitate was isolated by filtration, washed with a small amount of acetonitrile and dried (659 mg, 43% Yield). MS (ES+) 335.93 cooled in an ice bath The reaction was left to stir at 0-10° C. for a further hour

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

Procedure: 3-amino-6-bromo-pyrazine-2-carboxylic acid (1.000 g, 4.588 mmol) and benzenecarbothiohydrazide (759.1 mg, 4.588 mmol) were suspended in acetonitrile (25.00 mL), cooled in an ice bath and then treated with dibromo-triphenyl-phosphorane (4.453 g, 10.55 mmol) The reaction mixture was allowed to stir in an ice bath for 2 hours and then DIPEA (1.778 g, 2.396 mL, 13.76 mmol) was added slowly at 10° C. The reaction was left to stir at 0-10° C. for a further hour and the resultant precipitate was isolated by filtration, washed with a small amount of acetonitrile and dried (659 mg, 43% Yield). MS (ES+) 335.93 cooled in an ice bath The reaction was left to stir at 0-10° C. for a further hour

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

Procedure: A solution of benzenecarbothioic acid hydrazide (0.4g) and ethyl glyoxylate (0.4g) in ethanol (1 ml) was stirred at room temperature for 2 hours. The solvent was removed by evaporation and the residue re-evaporated with toluene (x2) to yield the sub-title product (0.7g) as a gum. The solvent was removed by evaporation the residue re-evaporated with toluene (x2)

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

Procedure: A solution of benzenecarbothioic acid hydrazide (2g) and benzyl glyoxylate (2.6g) in ethanol (5ml) was stirred at room temperature for 18 hours under nitrogen. The solvent was removed by evaporation and the residue was flash chromatographed to yield the sub-title product (3.5g) as a beige solid. The solvent was removed by evaporation chromatographed

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

Procedure: Add a solution of thiobenzoylsulfanylacetic acid methyl ester (1.9 g, 8.4 mmol) in ethanol (30 mL) to a solution of anhydrous hydrazine (1 mL) at room temperature under nitrogen and stir for 2 hours. Then add water (20 mL) and remove the solvent under reduced pressure. Dissolve the residue in ethyl acetate (300 mL), wash with water (200 mL) and brine (200 mL), and dry over magnesium sulfate. Remove the solvent under reduced pressure to provide thiobenzoic acid hydrazide (1.2 g, 94%). Then add water (20 mL) and remove the solvent under reduced pressure Dissolve the residue in ethyl acetate (300 mL) wash with water (200 mL) and brine (200 mL) dry over magnesium sulfate Remove the solvent under reduced pressure