ethyl 2-amino-5-fluorobenzoate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Following the procedures from Example 1A, and using ethyl 6-oxo-2-(methoxycarbonyl)-decahydroisoquinoline-3-carboxylate (537 mg, 1.9 mmol), 2-amino-5-fluoro-benzoic acid ethyl ester (183 mg, 1.0 mmol), glacial acetic acid (0.36 mL, 6.0 mmol), and sodium triacethoxyborohydride (590 mg, 2.8 mmol), flash chromatography (silica gel, hexane-ethyl acetate 3:1) afforded 95 mg (22% yield) of the title compound.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Following the procedures from Example 1A, and using ethyl 6-oxo-2-(methoxycarbonyl)-decahydroisoquinoline-3-carboxylate (537 mg, 1.9 mmol), 2-amino-5-fluoro-benzoic acid ethyl ester (183 mg, 1.0 mmol), glacial acetic acid (0.36 mL, 6.0 mmol), and sodium triacethoxyborohydride (590 mg, 2.8 mmol), flash chromatography (silica gel, hexane-ethyl acetate 3:1) afforded 95 mg (22% yield) of the title compound.

反応条件: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2,4-dichlorophenyl isocyanate (47.0 g, 0.25 mol) in xylene (130 ml) is metered at room temperature into a solution of ethyl 5-fluoroanthranilate (45.2 g, 0.25 mol) in xylene (210 ml). After addition is complete, the mixture is stirred at 90° C. for 2 hours. Triethylamine (3.5 ml, 2.55 g, 0.025 mol) is metered in. The mixture is stirred at 90° C. for a further 2 hours. After cooling, the product is filtered off with suction and washed with 3×30 ml of xylene and dried. 86.9 g of ethyl N-(2,4-dichlorophenylcarbamoyl)-5-fluoroanthranilate of melting point 219° to 223° C. (decomposition) are obtained. The cyclization product 3-(2,4-dichlorophenyl)-6-fluoro-2,4(1H,3H)-quinazolinedione cannot be detected by thin-layer chromatography. After addition The mixture is stirred at 90° C. for a further 2 hours After cooling the product is filtered off with suction washed with 3×30 ml of xylene dried

反応条件: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2,4-dichlorophenyl isocyanate (18.8 g, 0.10 mol) in N-methylpyrrolidone (50 ml) is metered at room temperature into a solution of ethyl 5-fluoroanthranilate (18.3 g, 0.10 mol) in N-methylpyrrolidone (70 ml). After addition is complete, the mixture is stirred at 90° C. for 2 hours. 1.80 ml of a 30% strength solution of methanolic sodium methoxide (0.010 mol) are metered in and the mixture is stirred under reflux for a further 2 hours, ethanol and methanol being distilled off. After cooling, the product is precipitated by addition of dilute hydrochloric acid (100 ml). The product is then filtered off with suction, washed with water and dried. 29.8 g of 3-(2,4-dichlorophenyl)-6-fluoro-2,4(1H,3H)-quinazolinedione (yield: 91.7% of theory) of melting point 311° to 313° C. are obtained. After addition is stirred under reflux for a further 2 hours ethanol and methanol being distilled off After cooling the product is precipitated by addition of dilute hydrochloric acid (100 ml) The product is then filtered off with suction washed with water dried

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 2,4-dichlorophenyl isocyanate (18.8 g, 0.10 mol) is introduced in portions at room temperature into a solution of ethyl 5-fluoroanthranilate (18.3 g, 0.10 mol) in hexane (120 ml). After addition is complete, the mixture is stirred under reflux for 2 hours. 3.60 ml of a 30% strength solution of methanolic sodium methoxide (0.020 mol) are metered in and the mixture is stirred under reflux for a further 2 hours, ethanol and methanol being distilled off. After cooling, the product is filtered off with suction and washed with 3×15 ml of hexane. The hexane-moist precipitate is treated with dilute hydrochloric acid and the residual hexane is removed by azeotropic distillation. The product is then filtered off with suction, washed with water and dried. 31.2 g of 3-(2,4-dichlorophenyl)-6-fluoro-2,4(1H,3H) -quinazolinedione (yield: 96.0% of theory) of melting point 312° to 314° C. are obtained. After addition under reflux for 2 hours is stirred under reflux for a further 2 hours ethanol and methanol being distilled off After cooling the product is filtered off with suction washed with 3×15 ml of hexane The hexane-moist precipitate is treated with dilute hydrochloric acid the residual hexane is removed by azeotropic distillation The product is then filtered off with suction washed with water dried

反応条件: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2,4-dichlorophenyl isocyanate (18.8 g, 0.10 mol) in acetone (50 ml) is metered at room temperature into a solution of ethyl 5-fluoroanthranilate (18.3 g, 0.10 mol) in acetone (70 ml). After addition is complete the mixture is stirred at 90° C. for 2.5 hours. 1.80 ml of a 30% strength solution of methanolic sodium methoxide (0.010 mol) are metered in and the mixture is stirred under reflux for a further 2 hours. After cooling, the product is filtered off with suction and washed with 3×15 ml of acetone. The acetone-moist precipitate is treated with dilute hydrochloric acid and the residual acetone is removed by azeotropic distillation. The product is then filtered off with suction, washed with water and dried. 31.7 g of 3-(2,4-dichlorophenyl)-6-fluoro-2,4(1H,3H)-quinazolinedione (yield: 97.5% of theory) of melting point 313° to 314° C. are obtained. After addition is stirred under reflux for a further 2 hours After cooling the product is filtered off with suction washed with 3×15 ml of acetone The acetone-moist precipitate is treated with dilute hydrochloric acid the residual acetone is removed by azeotropic distillation The product is then filtered off with suction washed with water dried

反応条件: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2,4-dichlorophenyl isocyanate (47.0 g, 0.25 mol) in xylene (130 ml) is metered at room temperature into a solution of ethyl 5-fluoroanthranilate (45.2 g, 0.25 mol) in xylene (210 ml). After addition is complete, the mixture is stirred at 90° C. for 2.5 hours. 4.50 ml of a 30% strength solution of methanolic sodium methoxide (0.025 mol) are metered in and the mixture is stirred at 90° C. for a further 2 hours, ethanol and methanol being distilled off. After cooling, the product is filtered off with suction and washed with 3×30 ml of xylene. The xylene-moist precipitate is treated with dilute hydrochloric acid and the residual xylene is removed by azeotropic distillation. The product is then filtered off with suction, washed with water and dried. 73.4 g of 3-(2,4 dichlorophenyl)-6-fluoro-2,4(1H,3H)-quinazolinedione (yield: 90.3% of theory) of melting point 313° to 314° C. are obtained. After addition is stirred at 90° C. for a further 2 hours ethanol and methanol being distilled off After cooling the product is filtered off with suction washed with 3×30 ml of xylene The xylene-moist precipitate is treated with dilute hydrochloric acid the residual xylene is removed by azeotropic distillation The product is then filtered off with suction washed with water dried

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Following the procedures from Example 1A, and using ethyl 6-oxo-2-(methoxycarbonyl)-decahydroisoquinoline-3-carboxylate (537 mg, 1.9 mmol), 2-amino-5-fluoro-benzoic acid ethyl ester (183 mg, 1.0 mmol), glacial acetic acid (0.36 mL, 6.0 mmol), and sodium triacethoxyborohydride (590 mg, 2.8 mmol), flash chromatography (silica gel, hexane-ethyl acetate 3:1) afforded 95 mg (22% yield) of the title compound.