2-amino-6-bromo-4-chlorophenol

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: 8-Bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine used in this Example was prepared by first reacting 2-amino-6-bromo-4-chloro-phenol with chloroacetyl chloride to provide 8-bromo-6-chloro-4H-benzo[1,4]oxazin-3-one using the procedure reported by Combs et al.; J. Med. Chem.; 33; 380-386 1990. This benzoxazinone was then reduced to 8-bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine using borane in THF according to the procedure described in Tetrahedron; 53(26); 8853-8870 1997. was prepared

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

Procedure: 8-Bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine used in this Example was prepared by first reacting 2-amino-6-bromo-4-chloro-phenol with chloroacetyl chloride to provide 8-bromo-6-chloro-4H-benzo[1,4]oxazin-3-one using the procedure reported by Combs et al.; J. Med. Chem.; 33; 380-386 1990. This benzoxazinone was then reduced to 8-bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine using borane in THF according to the procedure described in Tetrahedron; 53(26); 8853-8870 1997. was prepared

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

Procedure: 8-Bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine used in this Example was prepared by first reacting 2-amino-6-bromo-4-chloro-phenol with chloroacetyl chloride to provide 8-bromo-6-chloro-4H-benzo[1,4]oxazin-3-one using the procedure reported by Combs et al.; J. Med. Chem.; 33; 380-386 1990. This benzoxazinone was then reduced to 8-bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine using borane in THF according to the procedure described in Tetrahedron; 53(26); 8853-8870 1997. was prepared

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

Procedure: Using the normal amide forming conditions, the condensation of 3-chlorophenylacetic acid (13.54 g, 0.079 mol) and 2-hydroxy-3-bromo-5-chloroaniline (17.7 g, 0.079 mol) with 1,1′-carbonyl diimidazole (13.5 g, 0.083 mol) gave the title compound (20 g).

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

Procedure: Water (173 ml) and sodium carbonate (33.24 g, 310 mmol) were added to a stirred ethereal solution (123 ml) of 6-amino-2-bromo-4-chloro-phenol (17.45 g, 78.4 mmol). After 15 minutes 3,5-di-t-butyl-4-hydroxy-phenylacetyl chloride (47.60 g, 93.1%, 156.8 mmol) (prepared with thionyl chloride from the corresponding acid), was added at −5° to 0° C. and stirring continued for a further 1.5 hours without cooling. The aqueous phase was adjusted to pH 8 and the layers separated. The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated in-vacuo to give 58.1 g (103.6%) of the title compound which was suitable for the next step. was added at −5° to 0° C. without cooling the layers separated The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated in-vacuo

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

Procedure: A solution of 2-bromo-4-chloro-6-nitro-phenol (16.27 g, 64.4mmol) in ethyl acetate (160 ml) was hydrogenated, at room temperature, with Raney-nickel (6 g). After hydrogen uptake (approx. 4.8 l) was complete, the nickel was removed by filtration and the filtrate evaporated in-vacuo to give 14.19 g (99.0%) of the title compound which was suitable for the next step. the nickel was removed by filtration the filtrate evaporated in-vacuo

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

Procedure: Water (173 ml) and sodium carbonate (33.24 g, 310 mmol) were added to a stirred ethereal solution (123 ml) of 6-amino-2-bromo-4-chloro-phenol (17.45 g, 78.4 mmol). After 15 minutes 3,5-di-t-butyl-4-hydroxy-phenyl acetyl chloride (47.60 g, 93.1%, 156.8 mmol) (prepared with thionyl chloride from the corresponding acid), was added at −5E to 0EC and stirring continued for a further 1.5 hours without cooling. The aqueous phase was adjusted to pH 8 and the layers separated. The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated into give 58.1 g (103.6%) of the title compound which was suitable for the next step. was added at −5E to 0EC without cooling the layers separated The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated

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

Procedure: Water (173 ml) and sodium carbonate (33.24 g, 310 mmol) were added to a stirred ethereal solution (123 ml) of 6-amino-2-bromo-4-chloro-phenol (17.45 g, 78.4 mmol). After 15 minutes 3,5-di-t-butyl-4-hydroxy-phenyl acetyl chloride (47.60 g, 93.1%, 156.8 mmol) (prepared with thionyl chloride from the corresponding acid), was added at −5E to 0EC and stirring continued for a further 1.5 hours without cooling. The aqueous phase was adjusted to pH 8 and the layers separated. The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated into give 58.1 g (103.6%) of the title compound which was suitable for the next step. was added at −5E to 0EC without cooling the layers separated The organics were washed with 1 N HCl (100 ml) and saturated aqueous sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated

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

Procedure: A solution of 2-bromo-4-chloro-6-nitro-phenol (16.27 g, 64.4 mmol) in ethyl acetate (160 ml) was hydrogenated, at room temperature, with Raney-nickel (6 g). After hydrogen uptake (approx. 4.8 l) was complete, the nickel was removed by filtration and the filtrate evaporated in-vacuo to give 14.19 g (99.0%) of the title compound which was suitable for the next step. the nickel was removed by filtration the filtrate evaporated in-vacuo

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

Procedure: 8-Bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine used in this Example was prepared by first reacting 2-amino-6-bromo-4-chloro-phenol with chloroacetyl chloride to provide 8-bromo-6-chloro-4H-benzo[1,4]oxazin-3-one using the procedure reported by Combs et al.; J. Med. Chem.; 33; 380-386 1990. This benzoxazinone was then reduced to 8-bromo-6-chloro-2,3-dihydro-benzo[1,4]oxazine using borane in THF according to the procedure described in Tetrahedron; 53(26); 8853-8870 1997. was prepared