propan-2-yl 5-amino-2-chlorobenzoate

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: Thionyl chloride (6.5 g, 0.055 mole) was added slowly to a stirred solution of 5,6-dihydro-3-methyl-1, 4-dithiin-2-carboxylic acid (3 g, 0.017 mole) in toluene (15 ml) at room temperature. The mixture was heated under reflux for 4 hours. The excess toluene and thionyl chloride were removed in a rotary evaporator, yielding the crude acid chloride. 1-Methylethyl 5-amino-2-chlorobenzoate (3 g, 0.014 mole) in pyridine (20 ml) was added slowly to a stirred solution of the crude acid chloride (3 g) in methylene chloride (20 ml) at 20° C. The mixture was stirred for 24 hours, poured onto ice and concentrated hydrochloric acid, washed twice with water, dried with magnesium sulfate, and the methylene chloride evaporated. Recrystallization from 95% ethanol yielded the title compound, m.p. 122°-124° C. (3 g, 57% yield). The mixture was heated under reflux for 4 hours The excess toluene and thionyl chloride were removed in a rotary evaporator yielding the crude acid chloride washed twice with water dried with magnesium sulfate the methylene chloride evaporated Recrystallization from 95% ethanol

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

Procedure: A mixture of tetrachlorophthalic anhydride (2.97 g, 0.010 mole), 1-methylethyl 5-amino-2-chlorobenzoate (2.22 g, 0.010 mole) and toluene (100 ml) was heated slowly to reflux with stirring, then left overnight at room temperature. Filtration of the reaction mixture gave the title compound, m.p. 178°-179° C. (3.45 g, 70% yield). was heated slowly to reflux Filtration of the reaction mixture

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

Procedure: Tetrabromophthalic anhydride (7.03 g, 0.015 mole), 1-methylethyl 5-amino-2-chlorobenzoate (3.24 g, 0.015 mole) and toluene (about 150 ml) were heated almost to reflux over 30 minutes. The reaction mixture was cooled and filtered to give the title compound, m.p. 169°-171° C. (decomp.) (8.92 g, 87% yield). to reflux over 30 minutes The reaction mixture was cooled filtered

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

Procedure: 2-Methoxybenzoyl chloride (8.8 g, 0.05 mole) was added at room temperature under a dry nitrogen atmosphere to a stirred mixture of 1-methylethyl 5-amino-2-chlorobenzoate (10.7 g, 0.05 mole), triethylamine (5.6 g, 0.055 mole) and 4-(N,N,-dimethylamino)pyridine (catalyst, 0.2 g) dissolved in dry p-dioxane (100 ml . A solid Precipitate formed. Following the initial exothermic reaction (temperature increased to about 45° C.), the reaction mixture was stirred under nitrogen at room temperature for 20 hours. Next, the reaction mixture was added to water (500 ml), resulting in the precipitation of a solid product, which was collected by vacuum filtration, washed with water (500 ml), and dried to yield 16.2 g of the title compound, m.p. 94°-96° C. NMR: (CDCl3) : 1.40 (6H,d) 4.05 (3H,s)5.28 (1H,m), 7.02 (1H,d), 7.11 (1H,m), 7.38 (1H,d), 7.49 (1H,m), 7.87 (1H,m), 7.95 (1H,d), 8.25 (1H,m), 9.86 (1H,s) A solid Precipitate formed exothermic reaction (temperature increased to about 45° C.) resulting in the precipitation of a solid product, which was collected by vacuum filtration washed with water (500 ml) dried

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

Procedure: A solution of 2,4,5-trimethyl-3-furancarbonyl chloride (7.8 g, 0.045 mole) in toluene (25 ml) was added to 1-methylethyl 5-amino-2-chlorobenzoate (10.6 g, 0.050 mole) and triethylamine (6 g) in toluene (25 ml). The mixture was warmed to 60° C. for about 1 hour, then washed in sequence with dilute hydrochloric acid, water, aqueous 5% sodium bicarbonate and water. The solution was dried with magnesium sulfate, filtered and evaporated. The residue was crystallized from toluene/petroleum ether to give 6.7 g of a pale yellow solid, m.p. 83°-85° C. washed in sequence with dilute hydrochloric acid, water, aqueous 5% sodium bicarbonate and water The solution was dried with magnesium sulfate filtered evaporated The residue was crystallized from toluene/petroleum ether

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

Procedure: Methanesulfonic acid (99%, 318 g, 3.3 mole) was added slowly to a stirred mixture of 5-amino-2-chlorobenzoic acid (85%, 215 g, 1.1 mole) in 2-propanol (about 1100 ml). The mixture was heated under reflux with stirring for 6 hours, then the excess 2-propanol was evaporated under reduced pressure. Water (about 1000 ml) was added to the residue and the mixture was neutralized with solid sodium bicarbonate and extracted with methylene chloride (about 1200 ml). The extract was washed twice with water, dried over magnesium sulfate and evaporated to give a purple oil, which crystallized on seeding. The product was reprecipitated from dilute hydrochloric acid solution by slowly basifying with concentrated ammonium hydroxide and seeding. The resulting crystals after drying melted at 50.5°-52° C. (170 g, 75% yield). The mixture was heated under reflux the excess 2-propanol was evaporated under reduced pressure Water (about 1000 ml) was added to the residue extracted with methylene chloride (about 1200 ml) The extract was washed twice with water dried over magnesium sulfate evaporated to give a purple oil, which crystallized on seeding The product was reprecipitated from dilute hydrochloric acid solution The resulting crystals after drying melted at 50.5°-52° C. (170 g, 75% yield)

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

Procedure: Thionyl chloride (6.5 g, 0.055 mole) was added slowly to a stirred solution of 5,6-dihydro-3-methyl-1, 4-dithiin-2-carboxylic acid (3 g, 0.017 mole) in toluene (15 ml) at room temperature. The mixture was heated under reflux for 4 hours. The excess toluene and thionyl chloride were removed in a rotary evaporator, yielding the crude acid chloride. 1-Methylethyl 5-amino-2-chlorobenzoate (3 g, 0.014 mole) in pyridine (20 ml) was added slowly to a stirred solution of the crude acid chloride (3 g) in methylene chloride (20 ml) at 20° C. The mixture was stirred for 24 hours, poured onto ice and concentrated hydrochloric acid, washed twice with water, dried with magnesium sulfate, and the methylene chloride evaporated. Recrystallization from 95% ethanol yielded the title compound, m.p. 122°-124° C. (3 g, 57% yield). The mixture was heated under reflux for 4 hours The excess toluene and thionyl chloride were removed in a rotary evaporator yielding the crude acid chloride washed twice with water dried with magnesium sulfate the methylene chloride evaporated Recrystallization from 95% ethanol

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

Procedure: Thionyl chloride (6.5 g, 0.055 mole) was added slowly to a stirred solution of 5,6-dihydro-3-methyl-1, 4-dithiin-2-carboxylic acid (3 g, 0.017 mole) in toluene (15 ml) at room temperature. The mixture was heated under reflux for 4 hours. The excess toluene and thionyl chloride were removed in a rotary evaporator, yielding the crude acid chloride. 1-Methylethyl 5-amino-2-chlorobenzoate (3 g, 0.014 mole) in pyridine (20 ml) was added slowly to a stirred solution of the crude acid chloride (3 g) in methylene chloride (20 ml) at 20° C. The mixture was stirred for 24 hours, poured onto ice and concentrated hydrochloric acid, washed twice with water, dried with magnesium sulfate, and the methylene chloride evaporated. Recrystallization from 95% ethanol yielded the title compound, m.p. 122°-124° C. (3 g, 57% yield). The mixture was heated under reflux for 4 hours The excess toluene and thionyl chloride were removed in a rotary evaporator yielding the crude acid chloride washed twice with water dried with magnesium sulfate the methylene chloride evaporated Recrystallization from 95% ethanol

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

Procedure: A mixture of tetrachlorophthalic anhydride (2.97 g, 0.010 mole), 1-methylethyl 5-amino-2-chlorobenzoate (2.22 g, 0.010 mole) and toluene (100 ml) was heated slowly to reflux with stirring, then left overnight at room temperature. Filtration of the reaction mixture gave the title compound, m.p. 178°-179° C. (3.45 g, 70% yield). was heated slowly to reflux Filtration of the reaction mixture