2-(N-hydroxy-C-methylcarbonimidoyl)phenol

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

Procedure: Acetic anhydride (7.1 mL, 75 mmol) was added to 24 (7.55 g, 50 mmol) in a 100 mL flask. The mixture was heated to 60° C. for 3 hours followed by evaporation to dryness. Potassium carbonate (8.7 g, 63 mmol) was partly dissolved in 40 mL DMF and added to the mixture. The mixture was stirred at room temperature overnight and finally heated to 100° C. for 30 minutes. Ethyl acetate and water were added. The phases were separated and the aqueous phase was extracted with ethyl acetate and dichloromethane. The combined organic phases were dried over magnesium sulphate and evaporated to dryness to give 5.6 g of a yellow oil. Crude product was purified by column chromatography (100% dichloromethane), producing pure 25 (4.6 g). 1H NMR (CDCl3) δ 2.6 (s, 3H), 7.3 (m, 1H), 7.55 (m, 2H), 7.65 (m, 1H). followed by evaporation to dryness added to the mixture finally heated to 100° C. for 30 minutes The phases were separated the aqueous phase was extracted with ethyl acetate and dichloromethane The combined organic phases were dried over magnesium sulphate evaporated to dryness

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hydroxylammoniumchloride (6.96 g, 100 mmol) and sodium acetate. 3H2O (13.6 g, 100 mmol) were dissolved in 150 mL ethanol:water (7:3) and added to a solution of 2-hydroxyacetophenone (6.81 g, 50 mmol) in 50 mL ethanol:water (7:3). The pH was adjusted to 4–5 with 4N HCl (˜10 mL) and the reaction mixture was then heated to reflux (100° C.) for 1 hour. The oil bath was removed and the mixture was left overnight with stirring. Ethanol was partly removed by evaporation and the aqueous phase was extracted with ethyl acetate two times. The combined organic phases were dried over magnesium sulphate and evaporated to dryness to produce 7.55 g of pure 24. the reaction mixture was then heated The oil bath was removed Ethanol was partly removed by evaporation the aqueous phase was extracted with ethyl acetate two times The combined organic phases were dried over magnesium sulphate evaporated to dryness to produce 7.55 g of pure 24

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

Procedure: Acetic anhydride (7.1 mL, 75 mmol) was added to 24 (7.55 g, 50 mmol) in a 100 mL flask. The mixture was heated to 60° C. for 3 hours followed by evaporation to dryness. Potassium carbonate (8.7 g, 63 mmol) was partly dissolved in 40 mL DMF and added to the mixture. The mixture was stirred at room temperature overnight and finally heated to 100° C. for 30 minutes. Ethyl acetate and water were added. The phases were separated and the aqueous phase was extracted with ethyl acetate and dichloromethane. The combined organic phases were dried over magnesium sulphate and evaporated to dryness to give 5.6 g of a yellow oil. Crude product was purified by column chromatography (100% dichloromethane), producing pure 25 (4.6 g). 1H NMR (CDCl3) δ2.6 (s, 3H), 7.3 (m, 1H), 7.55 (m, 2H), 7.65 (m, 1H). followed by evaporation to dryness added to the mixture finally heated to 100° C. for 30 minutes The phases were separated the aqueous phase was extracted with ethyl acetate and dichloromethane The combined organic phases were dried over magnesium sulphate evaporated to dryness

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hydroxylammoniumchloride (6.96 g, 100 mmol) and sodium acetate.3H2O (13.6 g, 100 mmol) were dissolved in 150 mL ethanol:water (7:3) and added to a solution of 2-hydroxyacetophenone (6.81 g, 50 mmol) in 50 mL ethanol:water (7:3). The pH was adjusted to 4-5 with 4N HCl (˜10 mL) and the reaction mixture was then heated to reflux (100° C.) for 1 hour. The oil bath was removed and the mixture was left overnight with stirring. Ethanol was partly removed by evaporation and the aqueous phase was extracted with ethyl acetate two times. The combined organic phases were dried over magnesium sulphate and evaporated to dryness to produce 7.55 g of pure 24. the reaction mixture was then heated The oil bath was removed Ethanol was partly removed by evaporation the aqueous phase was extracted with ethyl acetate two times The combined organic phases were dried over magnesium sulphate evaporated to dryness to produce 7.55 g of pure 24