methyl 2-(3-amino-4-hydroxyphenyl)acetate

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

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: 2,5-Dimethoxy-3,4,6-trimethylbenzoic acid (m.p. 98°-100° C. was reacted with methyl 3-amino-4-hydroxyphenylacetate to give methyl 4-hydroxy-3-(2,5-dimethoxy-3,4,6-trimethylbenzoylamino)phenylacetate [m.p. 159°-160° C., δ 2.14 (3H), 2.20 (3H), 2.32 (3H), 3.48 (2H), 3.65 (6H), 3.70 (3H), 7.02 (3H), 8.30 (1H), 8.87 (1H)] (11.0 g, 28.4 mmol), which was dehydrated with phosphorus oxychloride (13.1 g) to give methyl 2-[6-(2,5-dimethoxy-3,4,6-trimethylphenyl)benzoxazol-6-yl]acetate m.p. 68°-69° C., δ 2.22 (3H), 2.27 (3H), 3.58 (3H), 3.70(3H), 3.72 (3H), 3.76 (2H), 7.32 (1H), 7.55 (1H), 7.76 (1H)] .

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

Procedure: Methyl-2-(3-amino-4-hydroxyphenyl)acetate (1.39 g, 7.67 mmol) was combined at RT with triethyl orthoformate (10 ml). The reaction mixture was heated to reflux for 12 h and then cooled to RT. Water (70 mL) was added thereto and the reaction mixture was extracted with EA. The combined organic phases were dried over MgSO4 and filtered. The solvent was removed under a vacuum and the residue purified by means of column chromatography (n-hexane/EA=2:1). The reaction mixture was heated to reflux for 12 h the reaction mixture was extracted with EA The combined organic phases were dried over MgSO4 filtered The solvent was removed under a vacuum the residue purified by means of column chromatography (n-hexane/EA=2:1)

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

Procedure: Methyl-2-(4-hydroxy-3-nitrophenyl)acetate (2.31 g, 10.9 mmol) was dissolved in THF (20 mL) and MeOH (20 mL) and 10% palladium on carbon (210 mg) was added slowly at RT. The reaction mixture was hydrogenated for 2 h at 39 psi hydrogen pressure, filtered through Celite and washed with MeOH. The solvent was removed under a vacuum and the residue purified by means of column chromatography (n-hexane/EA=2:1). filtered through Celite washed with MeOH The solvent was removed under a vacuum the residue purified by means of column chromatography (n-hexane/EA=2:1)

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

Procedure: 2,5-Dimethoxy-3,4,6-trimethylbenzoic acid (m.p. 98°-100° C.) was reacted with methyl 3-amino-4-hydroxyphenylacetate to give methyl 4-hydroxy-3-(2,5-dimethoxy-3,4,6-trimethylbenzoylamino)phenylacetate [m.p. 159°-160° C., δ 2.14 (3H), 2.20 (3H), 2.32 (3H), 3.48 (2H), 3.65 (6H), 3.70 (3H), 7.02 (3H), 8.30 (1H), 8.87 (1H)] (11.0 g, 28.4 mmol), which was dehydrated with phosphorus oxychloride (13.1 g) to give methyl 2-[6-(2,5-dimethoxy-3,4,6-trimethylphenyl)benzoxazol-6yl]acetate m.p. 68°-69° C., δ 2.22 (3H), 2.27 (3H), 3.58 (3H), 3.70 (3H), 3.72 (3H), 3.76 (2H), 7.32 (1H), 7.55 (1H), 7.76 (1H)] .

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

Procedure: 2,5-Dimethoxy-3,4,6-trimethylbenzoic acid (m.p. 98°-100° C.) was reacted with methyl 3-amino-4-hydroxyphenylacetate to give methyl 4-hydroxy-3-(2,5-dimethoxy-3,4,6-trimethylbenzoylamino)phenylacetate [m.p. 159°-160° C., δ 2.14 (3H), 2.20 (3H), 2.32 (3H), 3.48 (2H), 3.65 (6H), 3.70 (3H), 7.02 (3H), 8.30 (1H), 8.87 (1H)] (11.0 g, 28.4 mmol), which was dehydrated with phosphorus oxychloride (13.1 g) to give methyl 2-[6-(2,5-dimethoxy-3,4,6-trimethylphenyl)benzoxazol-6yl]acetate m.p. 68°-69° C., δ 2.22 (3H), 2.27 (3H), 3.58 (3H), 3.70 (3H), 3.72 (3H), 3.76 (2H), 7.32 (1H), 7.55 (1H), 7.76 (1H)] .

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

Procedure: 2,5-Dimethoxy-3,4,6-trimethylbenzoic acid (m.p. 98°-100° C. was reacted with methyl 3-amino-4-hydroxyphenylacetate to give methyl 4-hydroxy-3-(2,5-dimethoxy-3,4,6-trimethylbenzoylamino)phenylacetate [m.p. 159°-160° C., δ 2.14 (3H), 2.20 (3H), 2.32 (3H), 3.48 (2H), 3.65 (6H), 3.70 (3H), 7.02 (3H), 8.30 (1H), 8.87 (1H)] (11.0 g, 28.4 mmol), which was dehydrated with phosphorus oxychloride (13.1 g) to give methyl 2-[6-(2,5-dimethoxy-3,4,6-trimethylphenyl)benzoxazol-6-yl]acetate m.p. 68°-69° C., δ 2.22 (3H), 2.27 (3H), 3.58 (3H), 3.70(3H), 3.72 (3H), 3.76 (2H), 7.32 (1H), 7.55 (1H), 7.76 (1H)] .

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

Procedure: Sodium bicarbonate (51 g, 0.607 mol) was suspended in 1,2-dimethoxyethane (180 ml), and methyl(3-amino-4-hydroxyphenyl)acetate (58.26 g, 0.32 mol) was added, followed by a further quantity of 1,2-dimethoxyethane (75 ml). To this mixture was added, dropwise, a solution of heptafluorobutyryl chloride (112.5 g, 0.48 mol) in 1,2-dimethoxyethane (140 ml), at such a rate that the reaction temperature was maintained at 19-20° C. Once the addition was complete, the mixture was stirred at room temperature for 1½ hours. The reaction mixture was filtered and the solid was taken up in ethyl acetate and washed with saturated aqueous bicarbonate solution and brine. The organic phase was dried over anhydrous magnesium sulfate, filtered and the filtrate was evaporated in vacuo. The residue was taken up in acetone (450 ml) and water (450 ml) was added. The mixture was stirred for 1½ hours, during which time an oil separated. The aqueous acetone was decanted and a further quantity (250 ml) of water was added to the oil. The mixture was stirred for 1 hour, during which time the desired product crystallised; it was collected by filtration, washed with water and dried to give methyl(3-heptafluorobutyramido-4-hydroxyphenyl)acetate (87.0 g). To this mixture was added Once the addition The reaction mixture was filtered washed with saturated aqueous bicarbonate solution and brine The organic phase was dried over anhydrous magnesium sulfate filtered the filtrate was evaporated in vacuo water (450 ml) was added The mixture was stirred for 1½ hours, during which time an oil separated The aqueous acetone was decanted a further quantity (250 ml) of water was added to the oil The mixture was stirred for 1 hour, during which time the desired product crystallised it was collected by filtration washed with water dried

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

Procedure: Sodium hydrogen carbonate (19 g, 0.23 mol) was suspended in 1,2-dimethoxyethane (180 ml), and methyl(3-amino-4-hydroxyphenyl)acetate [from step 4] (26.3 g, 0.145 mole) was added. To this mixture was added, dropwise, a solution of tert-butylacetyl chloride in 1,2-dimethoxyethane (45 ml), over 2 hours. Once the addition was complete, the mixture was stirred at room temperature for 1 hour. The mixture was filtered, the inorganic solid washed with ethyl acetate (3×50 ml) and the filtrate and washings were combined and concentrated. Trituration of the product with hexane gave methyl [3-(2,2-dimethylpropionamido)-4-hydroxyphenyl]acetate (40.1 g) as an off-white solid, m.p. 112-113° C. To this mixture was added Once the addition The mixture was filtered the inorganic solid washed with ethyl acetate (3×50 ml) concentrated

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

Procedure: Methyl(4-hydroxy-3-nitrophenyl)acetate [from step 3] (48.9 g, 0.23 mole) and 5% palladium on carbon were suspended in methanol and the resulting mixture was hydrogenated until all the starting material had been consumed. The reaction mixture was filtered to remove the catalyst and the filtercake was washed with methanol. The combined filtrate and washings were concentrated in vacuo, affording methyl(3-amino-4-hydroxyphenyl)acetate as a solid (41.0 g). had been consumed The reaction mixture was filtered to remove the catalyst the filtercake was washed with methanol The combined filtrate and washings were concentrated in vacuo