5-methylhexane-2,4-dione

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

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)

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

Procedure: To a stirred solution of N-[3-(trifluoromethyl)phenyl]urea (6.37 g, 31.2 mmol), 4-cyanobenzaldehyde (4.09 g, 31.2 mmol) and 5-methylhexane-2,4-dione (4.0 g, 31.2 mmol) in tetrahydrofuran (150 ml) is added ethyl polyphosphate (12 g). The mixture is stirred at reflux for 18 hours. After cooling down to room temperature, the solvent is removed in vacuo and the residue is purified by column chromatography on silica with cyclohexane/ethyl acetate as eluent. at reflux for 18 hours the solvent is removed in vacuo the residue is purified by column chromatography on silica with cyclohexane/ethyl acetate as eluent

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

Procedure: To a stirred solution of N-[3-(trifluoromethyl)phenyl]urea (6.37 g, 31.2 mmol), 4-cyanobenzaldehyde (4.09 g, 31.2 mmol) and 5-methylhexane-2,4-dione (4.0 g, 31.2 mmol) in tetrahydrofuran (150 ml) is added ethyl polyphosphonate (12 g). The mixture is stirred at reflux for 18 hours. After cooling down to room temperature, the solvent is removed in vacuo and the residue is purified by column chromatography on silica with cyclohexane/ethyl acetate as eluent. at reflux for 18 hours the solvent is removed in vacuo the residue is purified by column chromatography on silica with cyclohexane/ethyl acetate as eluent

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

Procedure: Chlorotrimethylsilane (13.4 ml, 105 mmol) was added dropwise to a stirred pale yellow solution of tetrabutylammonium iodide (566 mg, 1.53 mmol) in dry acetonitrile (100 ml) at room temperature under nitrogen. The resulting solution was cooled in ice and 5-methylhexane-2,4-dione (4.50 g, 35.1 mmol) and then dry dimethylsulphoxide (7.47 ml, 105 mmol) were added dropwise over 5 minutes producing a yellow solution which was allowed to warm slowly to room temperature with stirring over 1 hour. Tetrabutylammonium bromide (566 mg, 1.75 mmol) was then added in one portion and the reaction was stirred at room temperature for 2 hours. The mixture was diluted with water (200 ml), stirred for 10 min and then extracted with ether (3×100 ml). The combined ether layers were dried over magnesium sulphate, filtered and concentrated under reduced pressure to leave a yellow oil. The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume) to provide the title compound (2.00 g) as a colourless oil. The resulting solution was cooled in ice producing a yellow solution which the reaction was stirred at room temperature for 2 hours stirred for 10 min extracted with ether (3×100 ml) The combined ether layers were dried over magnesium sulphate filtered concentrated under reduced pressure to leave a yellow oil The crude product was purified by flash column chromatography on silica gel eluting with pentane:ethyl acetate (98:2, by volume)