ethyl N-[2-(trifluoromethoxy)phenyl]carbamate

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(Trifluoromethoxy)aniline (50 g, 0.282 mol) was dissolved in DME (1000 mL) and cooled to −5° C. Sodium hydride (12.3 g, 55%, 0.282 mol) was added in portions and the suspension was allowed to warm to room temperature. Ethyl chloroformate (23.5 mL, 0.245 mol) was added drop by drop and the mixture was stirred for 2 h at room temperature and for 1.5 h at reflux after addition was complete. Hydrolysis was with water (110 mL). The phases were separated and the water phase was extracted with ethyl acetate. The organic phases were washed with brine, pooled and dried with MgSO4. Evaporation of the solvent yielded 70.6 g of a brown oil, which was purified by chromatography on silica gel with hexane/ethyl acetate (6:1). This yielded the title compound, (44.2 g, 62%) as a beige yellow oil. (EI-MS: m/e=249.1 (M+)) to warm to room temperature at reflux after addition Hydrolysis The phases were separated the water phase was extracted with ethyl acetate The organic phases were washed with brine dried with MgSO4 Evaporation of the solvent

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

Procedure: (2-Trifluoromethoxy-phenyl)-carbamic acid ethyl ester (42.4 g, 0.17 mol) was dissolved in THF (800 mL) and cooled to −70 ° C. sec-BuLi in cyclohexane (280 mL, 1.3 M) was added dropwise at this temperature with stirring. Stirring was continued for 1 h after addition was complete. A solution of iodine (43.2 g, 0.17 mol) in THF (160 mL) was added dropwise at −70 ° C. Stirring was continued for 1 h after addition was complete and the mixture was hydrolysed with saturated ammonium chloride solution. Water was added and the mixture was extracted with diethyl ether. The organic phases were washed with 40% sodium bisulfite, water, brine, pooled and dried with MgSO4. Evaporation of the solvent yielded the title compound, (60.2 g, 94%) as a colorless amorphous solid. (EI-MS: m/e=374.9 (M+)) was added dropwise at this temperature Stirring after addition Stirring was continued for 1 h after addition the mixture was extracted with diethyl ether The organic phases were washed with 40% sodium bisulfite, water, brine dried with MgSO4 Evaporation of the solvent

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

Procedure: (2-Trifluoromethoxy-phenyl)-carbamic acid ethyl ester (42.4 g, 0.17 mol) was dissolved in THF (800 mL) and cooled to −70 ° C. sec-BuLi in cyclohexane (280 mL, 1.3 M) was added dropwise at this temperature with stirring. Stirring was continued for 1 h after addition was complete. A solution of iodine (43.2 g, 0.17 mol) in THF (160 mL) was added dropwise at −70 ° C. Stirring was continued for 1 h after addition was complete and the mixture was hydrolysed with saturated ammonium chloride solution. Water was added and the mixture was extracted with diethyl ether. The organic phases were washed with 40% sodium bisulfite, water, brine, pooled and dried with MgSO4. Evaporation of the solvent yielded the title compound, (60.2 g, 94%) as a colorless amorphous solid. (EI-MS: m/e=374.9 (M+)) was added dropwise at this temperature Stirring after addition Stirring was continued for 1 h after addition the mixture was extracted with diethyl ether The organic phases were washed with 40% sodium bisulfite, water, brine dried with MgSO4 Evaporation of the solvent

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

Procedure: A 1.4 M solution of sec-buthyllithium in cyclohexane (3.0 mL) was added drop-wise to a solution of ethyl N-[2-(trifluoromethoxy)phenyl]carbamate (0.5000 g, 0.002006 mol) in THF (9 mL) at −70° C. After stirring for 1 hour a solution of iodine (0.51 g, 0.002 mol) in THF (1.0 mL) was added drop-wise at −70° C. Stirring was continued for another 1 hour then the mixture was quenched with saturated ammonium chloride solution. Water (50 mL) was added and the mixture extracted with diethyl ether (3×40 mL). The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine, then dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 73% yield. 1H NMR (400 MHz, CDCl3): δ 1.29-1.36 (m, 3H), 4.21-4.28 (m, 2H), 6.21 (br, 1H), 7.05 (t, J=8.0 Hz, 1H), 7.30 (m, 1H) and 7.80 (dd, J=6.8, 1.2 Hz, 1H). MS (ES+): m/z 375.78 [MH+]. was added drop-wise at −70° C the mixture was quenched with saturated ammonium chloride solution Water (50 mL) was added the mixture extracted with diethyl ether (3×40 mL) The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine dried over Na2SO4 the solvent removed in vacuo

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

Procedure: Ethyl chloroformate (4.4 mL, 0.046 mol) was added to a mixture of 2-(trifluoromethoxy)aniline (8.25 g, 0.0466 mol), sodium carbonate (15 g, 0.14 mol), 1,4-dioxane (70 mL) and water (70 mL) at 0° C. and the the reaction mixture stirred at room temperature overnight. The reaction mixture was then washed with ether, acidified (pH 3) and the product extracted into EtOAc (3×40 mL). The combined extracts were washed with water (40 mL) and brine (40 mL), dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 84% yield. 1H NMR (400 MHz, CDCl3): δ 1.33 (t, J=5.2 Hz, 3H), 4.25 (q, J=6.8 Hz, 2H), 6.91 (br, 1H), 7.04 (m, 1H), 7.23 (m, 1H), 7.28 (m, 1H) and 8.2 (m, 1H). MS (ES+): m/z 250.12 [MH+]. The reaction mixture was then washed with ether the product extracted into EtOAc (3×40 mL) The combined extracts were washed with water (40 mL) and brine (40 mL) dried over Na2SO4 the solvent removed in vacuo

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-(Trifluoromethoxy)aniline (50 g, 0.282 mol) was dissolved in DME (1000 mL) and cooled to −5° C. Sodium hydride (12.3 g, 55%, 0.282 mol) was added in portions and the suspension was allowed to warm to room temperature. Ethyl chloroformate (23.5 mL, 0.245 mol) was added drop by drop and the mixture was stirred for 2 h at room temperature and for 1.5 h at reflux after addition was complete. Hydrolysis was with water (110 mL). The phases were separated and the water phase was extracted with ethyl acetate. The organic phases were washed with brine, pooled and dried with MgSO4. Evaporation of the solvent yielded 70.6 g of a brown oil, which was purified by chromatography on silica gel with hexane/ethyl acetate (6:1). This yielded the title compound, (44.2 g, 62%) as a beige yellow oil. (EI-MS: m/e=249.1 (M+)) to warm to room temperature at reflux after addition Hydrolysis The phases were separated the water phase was extracted with ethyl acetate The organic phases were washed with brine dried with MgSO4 Evaporation of the solvent

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

Procedure: (2-Trifluoromethoxy-phenyl)-carbamic acid ethyl ester (42.4 g, 0.17 mol) was dissolved in THF (800 mL) and cooled to −70° C. sec-BuLi in cyclohexane (280 mL, 1.3 M) was added dropwise at this temperature with stirring. Stirring was continued for 1 h after addition was complete. A solution of iodine (43.2 g, 0.17 mol) in THF (160 mL) was added dropwise at −70° C. Stirring was continued for 1 h after addition was complete and the mixture was hydrolysed with saturated ammonium chloride solution. Water was added and the mixture was extracted with diethyl ether. The organic phases were washed with 40% sodium bisulfite, water, brine, pooled and dried with MgSO4. Evaporation of the solvent yielded the title compound, (60.2 g, 94%) as a colorless amorphous solid. (EI-MS: m/e=374.9 (M+)) was added dropwise at this temperature Stirring after addition Stirring was continued for 1 h after addition the mixture was extracted with diethyl ether The organic phases were washed with 40% sodium bisulfite, water, brine dried with MgSO4 Evaporation of the solvent

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

Procedure: A 1.4 M solution of sec-butyllithiuni in cyclohexane (3.0 mL) was added drop-wise to a solution of ethyl N-[2-(trifluoromethoxy)phenyl]carbamate (0.5000 g, 0.002006 mol) in THF (9 mL) at −70° C. After stirring for 1 hour a solution of iodine (0.51 g, 0.002 mol) in THF (1.0 mL) was added drop-wise at −70° C. Stirring was continued for another 1 hour then the mixture was quenched with saturated ammonium chloride solution. Water (50 mL) was added and the mixture extracted with diethyl ether (3×40 mL). The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine, then dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 73% yield. 1H NMR (400 MHz, CDCl3): δ 1.29-1.36 (m, 3H), 4.21-4.28 (m, 2H), 6.21 (br, 1H), 7.05 (t, J=8.0 Hz, 1H), 7.30 (m, 1H) and 7.80 (dd, J=6.8, 1.2 Hz, 1H). MS (ES+): m/z 375.78 [MH+]. was added drop-wise at −70° C the mixture was quenched with saturated ammonium chloride solution Water (50 mL) was added the mixture extracted with diethyl ether (3×40 mL) The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine dried over Na2SO4 the solvent removed in vacuo

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

Procedure: Ethyl chloroformate (4.4 mL, 0.046 mol) was added to a mixture of 2-(trifluoromethoxy)aniline (8.25 g, 0.0466 mol), sodium carbonate (15 g, 0.14 mol), 1,4-dioxane (70 mL) and water (70 mL) at 0° C. and the the reaction mixture stirred at room temperature overnight. The reaction mixture was then washed with ether, acidified (pH 3) and the product extracted into EtOAc (3×40 mL). The combined extracts were washed with water (40 mL) and brine (40 mL), dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 84% yield. 1H NMR (400 MHz, CDCl3): δ 1.33 (t, J=5.2 Hz, 3H), 4.25 (q, J=6.8 Hz, 2H), 6.91 (br, 1H), 7.04 (m, 1H), 7.23 (m, 1H), 7.28 (m, 1H) and 8.2 (m, 1H). MS (ES+): m/z 250.12 [MH+]. The reaction mixture was then washed with ether the product extracted into EtOAc (3×40 mL) The combined extracts were washed with water (40 mL) and brine (40 mL) dried over Na2SO4 the solvent removed in vacuo

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

Procedure: A 1.4 M solution of sec-butyllithium in cyclohexane (3.0 mL) was added drop-wise to a solution of ethyl N-[2-(trifluoromethoxy)phenyl]carbamate (0.5000 g, 0.002006 mol) in THF (9 mL) at −70° C. After stirring for 1 hour a solution of iodine (0.51 g, 0.002 mol) in THF (1.0 mL) was added drop-wise at −70° C. Stirring was continued for another 1 hour then the mixture was quenched with saturated ammonium chloride solution. Water (50 mL) was added and the mixture extracted with diethyl ether (3×40 mL). The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine, then dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 73% yield. 1H NMR (400 MHz, CDCl3): δ 1.29-1.36 (m, 3H), 4.21-4.28 (m, 2H), 6.21 (br, 1H), 7.05 (t, J=8.0 Hz, 1H), 7.30 (m, 1H) and 7.80 (dd, J=6.8, 1.2 Hz, 1H). MS (ES+): m/z 375.78 [MH+]. was added drop-wise at −70° C the mixture was quenched with saturated ammonium chloride solution Water (50 mL) was added the mixture extracted with diethyl ether (3×40 mL) The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine dried over Na2SO4 the solvent removed in vacuo

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

Procedure: A 1.4 M solution of sec-butyllithium in cyclohexane (3.0 mL) was added drop-wise to a solution of ethyl N-[2-(trifluoromethoxy)phenyl]carbamate (0.5000 g, 0.002006 mol) in THF (9 mL) at −70° C. After stirring for 1 hour a solution of iodine (0.51 g, 0.002 mol) in THF (1.0 mL) was added drop-wise at −70° C. Stirring was continued for another 1 hour then the mixture was quenched with saturated ammonium chloride solution. Water (50 mL) was added and the mixture extracted with diethyl ether (3×40 mL). The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine, then dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 73% yield. 1H NMR (400 MHz, CDCl3): δ 1.29-1.36 (m, 3H), 4.21-4.28 (m, 2H), 6.21 (br, 1H), 7.05 (t, J=8.0 Hz, 1H), 7.30 (m, 1H) and 7.80 (dd, J=6.8, 1.2 Hz, 1H). MS (ES+): m/z 375.78 [MH+]. was added drop-wise at −70° C the mixture was quenched with saturated ammonium chloride solution Water (50 mL) was added the mixture extracted with diethyl ether (3×40 mL) The combined organic phases was washed with 40% sodium meta-bisulfite solution, water and brine dried over Na2SO4 the solvent removed in vacuo

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

Procedure: Ethyl chloroformate (4.4 mL, 0.046 mol) was added to a mixture of 2-(trifluoromethoxy)aniline (8.25 g, 0.0466 mol), sodium carbonate (15 g, 0.14 mol), 1,4-dioxane (70 mL) and water (70 mL) at 0° C. and the reaction mixture stirred at room temperature overnight. The reaction mixture was then washed with ether, acidified (pH 3) and the product extracted into EtOAc (3×40 mL). The combined extracts were washed with water (40 mL) and brine (40 mL), dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 84% yield. 1H NMR (400 MHz, CDCl3): δ 1.33 (t, J=5.2 Hz, 3H), 4.25 (q, J=6.8 Hz, 2H), 6.91 (br, 1H), 7.04 (m, 1H), 7.23 (m, 1H), 7.28 (m, 1H) and 8.2 (m, 1H). MS (ES+): m/z 250.12 [MH+]. The reaction mixture was then washed with ether the product extracted into EtOAc (3×40 mL) The combined extracts were washed with water (40 mL) and brine (40 mL) dried over Na2SO4 the solvent removed in vacuo