5-bromo-2-cyclopropylaniline

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: 5-Bromo-2-cyclopropylaniline (4.74 g) is added to a solution of para-toluene sulfonic acid monohydrate (12.2 g, 0.064 mol) in acetonitrile (130 ml), followed by stirring for 10 minutes at room temperature. The suspension is then cooled to 10° C. and a mixed solution of sodium nitrite (8.9 g, 0.054 mol) and potassium iodide (3.1 g, 0.044 mol) in water (16 ml) is added dropwise over 30 minutes. Once the addition is complete the reaction mixture is allowed to stir at 10° C. for 20 minutes and then at room temperature for 4 hours. The reaction mixture is basified to pH 9-10 with aqueous sodium bicarbonate, followed by addition of ethyl acetate and 10% aqueous sodium metabisulphite. The phases are separated and the aqueous layer is extracted again with ethyl acetate (×2). Organics are combined, washed with brine, dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant) to afford 5-bromo-2-cyclopropyliodobenzene as a colourless oil. The suspension is then cooled to 10° C. Once the addition to stir at 10° C. for 20 minutes at room temperature for 4 hours The phases are separated the aqueous layer is extracted again with ethyl acetate (×2) washed with brine dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant)

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

Procedure: Tin (II) chloride (16.0 g, 0.10 mol) is added in one portion to a solution of crude 5-bromo-2-cyclopropylnitrobenzene (8.68 g) in ethanol (190 ml) and water (1.9 ml). The reaction mixture is stirred at room temperature overnight, followed by addition of further tin (II) chloride (28 g, 0.175 mol) and additional stirring overnight. After concentration in vacuo ice is added, and the solution is basified with 2M aqueous sodium hydroxide. After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide, then also distilled water and brine. After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant) to afford 5-bromo-2-cyclopropylaniline as a brown oil. additional stirring overnight After concentration in vacuo ice is added After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant)

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

Procedure: 5-Bromo-2-cyclopropylaniline (4.74 g) is added to a solution of para-toluene sulfonic acid monohydrate (12.2 g, 0.064 mol) in acetonitrile (130 ml), followed by stirring for 10 minutes at room temperature. The suspension is then cooled to 10° C. and a mixed solution of sodium nitrite (8.9 g, 0.054 mol) and potassium iodide (3.1 g, 0.044 mol) in water (16 ml) is added dropwise over 30 minutes. Once the addition is complete the reaction mixture is allowed to stir at 10° C. for 20 minutes and then at room temperature for 4 hours. The reaction mixture is basified to pH 9-10 with aqueous sodium bicarbonate, followed by addition of ethyl acetate and 10% aqueous sodium metabisulphite. The phases are separated and the aqueous layer is extracted again with ethyl acetate (×2). Organics are combined, washed with brine, dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant) to afford 5-bromo-2-cyclopropyliodobenzene as a colourless oil. The suspension is then cooled to 10° C. Once the addition to stir at 10° C. for 20 minutes at room temperature for 4 hours The phases are separated the aqueous layer is extracted again with ethyl acetate (×2) washed with brine dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant)

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

Procedure: Tin (II) chloride (16.0 g, 0.10 mol) is added in one portion to a solution of crude 5-bromo-2-cyclopropylnitrobenzene (8.68 g) in ethanol (190 ml) and water (1.9 ml). The reaction mixture is stirred at room temperature overnight, followed by addition of further tin (II) chloride (28 g, 0.175 mol) and additional stirring overnight. After concentration in vacuo ice is added, and the solution is basified with 2M aqueous sodium hydroxide. After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide, then also distilled water and brine. After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant) to afford 5-bromo-2-cyclopropylaniline as a brown oil. additional stirring overnight After concentration in vacuo ice is added After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant)

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

Procedure: Tin (II) chloride (16.0 g, 0.10 mol) is added in one portion to a solution of crude 5-bromo-2-cyclopropylnitrobenzene (8.68 g) in ethanol (190 ml) and water (1.9 ml). The reaction mixture is stirred at room temperature overnight, followed by addition of further tin (II) chloride (28 g, 0.175 mol) and additional stirring overnight. After concentration in vacuo ice is added, and the solution is basified with 2M aqueous sodium hydroxide. After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide, then also distilled water and brine. After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant) to afford 5-bromo-2-cyclopropylaniline as a brown oil. additional stirring overnight After concentration in vacuo ice is added After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide After drying over magnesium sulfate the solution is concentrated in vcauo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant)

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

Procedure: 5-Bromo-2-cyclopropylaniline (4.74 g) is added to a solution of para-toluene sulfonic acid monohydrate (12.2 g, 0.064 mol) in acetonitrile (130 ml), followed by stirring for 10 minutes at room temperature. The suspension is then cooled to 10° C. and a mixed solution of sodium nitrite (8.9 g, 0.054 mol) and potassium iodide (3.1 g, 0.044 mol) in water (16 ml) is added dropwise over 30 minutes. Once the addition is complete the reaction mixture is allowed to stir at 10° C. for 20 minutes and then at room temperature for 4 hours. The reaction mixture is basified to pH 9-10 with aqueous sodium bicarbonate, followed by addition of ethyl acetate and 10% aqueous sodium metabisulphite. The phases are separated and the aqueous layer is extracted again with ethyl acetate (×2). Organics are combined, washed with brine, dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant) to afford 5-bromo-2-cyclopropyliodobenzene as a colourless oil. The suspension is then cooled to 10° C. Once the addition to stir at 10° C. for 20 minutes at room temperature for 4 hours The phases are separated the aqueous layer is extracted again with ethyl acetate (×2) washed with brine dried over magnesium sulfate then concentrated in vacuo to give the crude product which is purified by flash column chromatography on silica gel (isohexane eluant)

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

Procedure: Tin(II)chloride (16.0 g, 0.10 mol) is added in one portion to a solution of crude 5-bromo-2-cyclopropylnitrobenzene (8.68 g) in ethanol (190 ml) and water (1.9 ml). The reaction mixture is stirred at room temperature overnight, followed by addition of further tin(II)chloride (28 g, 0.175 mol) and additional stirring overnight. After concentration in vacuo ice is added, and the solution is basified with 2M aqueous sodium hydroxide. After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide, then also distilled water and brine. After drying over magnesium sulfate the solution is concentrated in vacuo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant) to afford 5-bromo-2-cyclopropylaniline as a brown oil. additional stirring overnight After concentration in vacuo ice is added After extraction with ethyl acetate (×2) the organic phase is washed again with 2M aqueous sodium hydroxide After drying over magnesium sulfate the solution is concentrated in vacuo to give a brown oil which is purified by flash column chromatography on silica gel (9:1 isohexane/ethyl acetate eluant)

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

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