2-AMINO-4-METHYLPHENYLBORONIC ACID, PINACOL ESTER

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: To a suspension of methyl 2-bromo-3-cyclohexyl-1-(2-oxopropyl)-1H-indole-6-carboxylate (700 mg, 1.78 mmol) and 5-methyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine (456 mg, 1.96 mmol) in 1,2-dimethoxyethane (6 ml) and water (2 ml) were added sodium hydrogen carbonate (177 mg, 2.14 mmol) and tetrakis(triphenylphosphine)palladium (103 mg, 0.09 mmol), and the mixture was heated under reflux for 4 hr. The reaction mixture was allowed to cool to room temperature, water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (hexane:ethyl acetate=3:1) to give methyl 2-(2-amino-4-methylphenyl)-3-cyclohexyl-1-(2-oxopropyl)-1H-indole-6-carboxylate (727 mg, yield 97%). the mixture was heated under reflux for 4 hr the mixture was extracted with ethyl acetate The organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine dried over anhydrous magnesium sulfate After filtration the solvent was evaporated under reduced pressure the residue was purified by silica gel chromatography (hexane:ethyl acetate=3:1)

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

Procedure: To a suspension of N-tert-butyl-2-bromo-3-cyclohexyl-1H-indole-6-sulfonamide (2.10 g, 5.08 mmol) and 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5-methylphenylamine (1.86 g, 8.00 mmol) in 1,2-dimethoxyethane (20 ml) and water (10 ml) were added sodium hydrogen carbonate (1.60 g, 19.2 mmol) and tetrakis(triphenylphosphine)palladium (176 mg, 0.15 mmol), and the mixture was heated under reflux for 14 hr. The reaction mixture was allowed to cool to room temperature, water was added to the reaction mixture and the mixture was extracted with toluene. The organic layer was successively washed with water and saturated brine and dried over anhydrous sodium sulfate. After filtration, the solvent was evaporated under reduced pressure and diisopropy ether was added to the residue. The precipitated solid was collected by filtration and dried in vacuo to give N-tert-butyl-2-(2-amino-4-methylphenyl)-3-cyclohexyl-1H-indole-6-sulfonamide (2.14 g, yield 96.3%). the mixture was heated under reflux for 14 hr the mixture was extracted with toluene The organic layer was successively washed with water and saturated brine dried over anhydrous sodium sulfate After filtration the solvent was evaporated under reduced pressure and diisopropy ether was added to the residue The precipitated solid was collected by filtration dried in vacuo

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

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

Procedure: To a suspension of methyl 2-bromo-3-cyclohexyl-1-(2-oxopropyl)-1H-indole-6-carboxylate (700 mg, 1.78 mmol) and 5-methyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine (456 mg, 1.96 mmol) in 1,2-dimethoxyethane (6 ml) and water (2 ml) were added sodium hydrogen carbonate (177 mg, 2.14 mmol) and tetrakis(triphenylphosphine)palladium (103 mg, 0.09 mmol), and the mixture was heated under reflux for 4 hr. The reaction mixture was allowed to cool to room temperature, water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (hexane:ethyl acetate=3:1) to give methyl 2-(2-amino-4-methylphenyl)-3-cyclohexyl-1-(2-oxopropyl)-1H-indole-6-carboxylate (727 mg, yield 97%). the mixture was heated under reflux for 4 hr the mixture was extracted with ethyl acetate The organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine dried over anhydrous magnesium sulfate After filtration the solvent was evaporated under reduced pressure the residue was purified by silica gel chromatography (hexane:ethyl acetate=3:1)

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

Procedure: To a suspension of N-tert-butyl-2-bromo-3-cyclohexyl-1H-indole-6-sulfonamide (2.10 g, 5.08 mmol) and 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5-methylphenylamine (1.86 g, 8.00 mmol) in 1,2-dimethoxyethane (20 ml) and water (10 ml) were added sodium hydrogen carbonate (1.60 g, 19.2 mmol) and tetrakis(triphenylphosphine)palladium (176 mg, 0.15 mmol), and the mixture was heated under reflux for 14 hr. The reaction mixture was allowed to cool to room temperature, water was added to the reaction mixture and the mixture was extracted with toluene. The organic layer was successively washed with water and saturated brine and dried over anhydrous sodium sulfate. After filtration, the solvent was evaporated under reduced pressure and diisopropy ether was added to the residue. The precipitated solid was collected by filtration and dried in vacuo to give N-tert-butyl-2-(2-amino-4-methylphenyl)-3-cyclohexyl-1H-indole-6-sulfonamide (2.14 g, yield 96.3%). the mixture was heated under reflux for 14 hr the mixture was extracted with toluene The organic layer was successively washed with water and saturated brine dried over anhydrous sodium sulfate After filtration the solvent was evaporated under reduced pressure and diisopropy ether was added to the residue The precipitated solid was collected by filtration dried in vacuo