2-hydroxy-2-phenylacetohydrazide

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

Procedure: Mandelic acid hydrazide (1.66 g) and trimethyl o-benzoate (1.82 g) were heated under stirring in dimethyl formamide (30 ml) at 120° C. for 12 hours in the presence of p-toluene sulfonate monohydrate (0.2 g). The solvent was evaporated, and the residue was partitioned between ethyl acetate (150 ml) and water (50 ml). The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml), and then dried over magnesium sulfate. The solvent was evaporated, and the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1), to give the title compound as a white powder (1.28 g, 51%). The solvent was evaporated the residue was partitioned between ethyl acetate (150 ml) and water (50 ml) The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml) dried over magnesium sulfate The solvent was evaporated the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1)

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

Procedure: Mandelic acid hydrazide (1.66 g) and trimethyl o-benzoate (1.82 g) were heated under stirring in dimethyl formamide (30 ml) at 120° C. for 12 hours in the presence of p-toluene sulfonate monohydrate (0.2 g). The solvent was evaporated, and the residue was partitioned between ethyl acetate (150 ml) and water (50 ml). The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml), and then dried over magnesium sulfate. The solvent was evaporated, and the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1), to give the title compound as a white powder (1.28 g, 51%). The solvent was evaporated the residue was partitioned between ethyl acetate (150 ml) and water (50 ml) The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml) dried over magnesium sulfate The solvent was evaporated the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1)

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

Procedure: Mandelic acid hydrazide (1.66 g) and trimethyl o-benzoate (1.82 g) were heated under stirring in dimethyl formamide (30 ml) at 120° C. for 12 hours in the presence of p-toluene sulfonate monohydrate (0.2 g). The solvent was evaporated, and the residue was partitioned between ethyl acetate (150 ml) and water (50 ml). The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml), and then dried over magnesium sulfate. The solvent was evaporated, and the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1), to give the title compound as a white powder (1.28 g, 51%). The solvent was evaporated the residue was partitioned between ethyl acetate (150 ml) and water (50 ml) The ethyl acetate layer was washed with water (50 ml×2) and brine (50 ml) dried over magnesium sulfate The solvent was evaporated the resulting residue was purified by silica gel chromatography (ethyl acetate/hexane, 1:1)