1-(2-methylpropyl)piperidin-2-one

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

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-isobutyl-2-piperidone (8.8 g) and aqueous methanesulfonic acid solution (10.9 g/19 ml) was refluxed at 110° C. for 3 days. To the mixture which was previously cooled to room temperature, were added water (10 ml) and sodium carbonate (18.0 g) slowly. Then, after heating the mixture at 50° C. for 1 hour, DMSO (13 ml) was added. The resulting mixture was heated to 135° C., and then a solution of 5-bromo-2-fluorobenzaldehyde (11.5 g) in DMSO (15 ml) was added dropwise. After stirring at 135° C. for 6 hours, the mixture was cooled to 0° C., and the mixture was adjusted to pH 2.5 by using 6N hydrochloric acid. After ethyl acetate extraction, the organic layer was dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate) to obtain brown oil of 5-(4-bromo-2-formyl-N-isobutylanilino)pentanoic acid (15.3 g). To the mixture which was previously cooled to room temperature Then, after heating the mixture at 50° C. for 1 hour The resulting mixture was heated to 135° C. the mixture was cooled to 0° C. After ethyl acetate extraction the organic layer was dried over magnesium sulfate The solvent was distilled off under reduced pressure the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate)

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

Procedure: A suspension of 85% potassium hydroxide (36.6 g), and tetrabutylammonium bromide (9.1 g) in toluene (400 ml) was refluxed overnight in a Dean Stalk apparatus. Then, a solution of 2-piperidone (50.0 g) and iodoisobutane (120.7 g) in toluene (150 ml) was added dropwise at 115° C. to the solution above. After the dropwise addition, the mixture was refluxed further for 2.5 hours, and then cooled, and filtered to remove insoluble matter. The filtrate was washed with water, and the aqueous layer was extracted with toluene. The organic layers were combined and dried over magnesium sulfate. After distilling off the solvent under reduced, the residue was separated and purified by silica gel column chromatography (ethyl acetate) to obtain yellow oil of 1-isobutyl-2-piperidone (9.3 g). was refluxed overnight in a Dean Stalk apparatus After the dropwise addition the mixture was refluxed further for 2.5 hours cooled filtered to remove insoluble matter The filtrate was washed with water the aqueous layer was extracted with toluene dried over magnesium sulfate After distilling off the solvent the residue was separated purified by silica gel column chromatography (ethyl acetate)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-isobutyl-2-piperidone (8.8 g) and aqueous methanesulfonic acid solution (10.9 g/19 ml) was refluxed at 110° C. for 3 days. To the mixture which was previously cooled to room temperature, were added water (10 ml) and sodium carbonate (18.0 g) slowly. Then, after heating the mixture at 50° C. for 1 hour, DMSO (13 ml) was added. The resulting mixture was heated to 135° C., and then a solution of 5-bromo-2-fluorobenzaldehyde (11.5 g) in DMSO (15 ml) was added dropwise. After stirring at 135° C. for 6 hours, the mixture was cooled to 0° C., and the mixture was adjusted to pH 2.5 by using 6N hydrochloric acid. After ethyl acetate extraction, the organic layer was dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate) to obtain brown oil of 5-(4-bromo-2-formyl-N-isobutylanilino)pentanoic acid (15.3 g). To the mixture which was previously cooled to room temperature Then, after heating the mixture at 50° C. for 1 hour The resulting mixture was heated to 135° C. the mixture was cooled to 0° C. After ethyl acetate extraction the organic layer was dried over magnesium sulfate The solvent was distilled off under reduced pressure the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate)

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

Procedure: A suspension of 85% potassium hydroxide (36.6 g), and tetrabutylammonium bromide (9.1 g) in toluene (400 ml) was refluxed overnight in a Dean Stalk apparatus. Then, a solution of 2-piperidone (50.0 g) and iodoisobutane (120.7 g) in toluene (150 ml) was added dropwise at 115° C. to the solution above. After the dropwise addition, the mixture was refluxed further for 2.5 hours, and then cooled, and filtered to remove insoluble matter. The filtrate was washed with water, and the aqueous layer was extracted with toluene. The organic layers were combined and dried over magnesium sulfate. After distilling off the solvent under reduced, the residue was separated and purified by silica gel column chromatography (ethyl acetate) to obtain yellow oil of 1-isobutyl-2-piperidone (9.3 g). was refluxed overnight in a Dean Stalk apparatus After the dropwise addition the mixture was refluxed further for 2.5 hours cooled filtered to remove insoluble matter The filtrate was washed with water the aqueous layer was extracted with toluene dried over magnesium sulfate After distilling off the solvent the residue was separated purified by silica gel column chromatography (ethyl acetate)

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

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-isobutyl-2-piperidone (8.8 g) and aqueous methanesulfonic acid solution (10.9 g/19 ml) was refluxed at 110° C. for 3 days. To the mixture which was previously cooled to room temperature, were added water (10 ml) and sodium carbonate (18.0 g) slowly. Then, after heating the mixture at 50° C. for 1 hour, DMSO (13 ml) was added. The resulting mixture was heated to 135° C., and then a solution of 5-bromo-2-fluorobenzaldehyde (11.5 g) in DMSO (15 ml) was added dropwise. After stirring at 135° C. for 6 hours, the mixture was cooled to 0° C., and the mixture was adjusted to pH 2.5 by using 6N hydrochloric acid. After ethyl acetate extraction, the organic layer was dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate) to obtain brown oil of 5-(4-bromo-2-formyl-N-isobutylanilino)pentanoic acid (15.3 g). To the mixture which was previously cooled to room temperature Then, after heating the mixture at 50° C. for 1 hour The resulting mixture was heated to 135° C. the mixture was cooled to 0° C. After ethyl acetate extraction the organic layer was dried over magnesium sulfate The solvent was distilled off under reduced pressure the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-isobutyl-2-piperidone (8.8 g) and aqueous methanesulfonic acid solution (10.9 g/19 ml) was refluxed at 110° C. for 3 days. To the mixture which was previously cooled to room temperature, were added water (10 ml) and sodium carbonate (18.0 g) slowly. Then, after heating the mixture at 50° C. for 1 hour, DMSO (13 ml) was added. The resulting mixture was heated to 135° C., and then a solution of 5-bromo-2-fluorobenzaldehyde (11.5 g) in DMSO (15 ml) was added dropwise. After stirring at 135° C. for 6 hours, the mixture was cooled to 0° C., and the mixture was adjusted to pH 2.5 by using 6N hydrochloric acid. After ethyl acetate extraction, the organic layer was dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate) to obtain brown oil of 5-(4-bromo-2-formyl-N-isobutylanilino)pentanoic acid (15.3 g). To the mixture which was previously cooled to room temperature Then, after heating the mixture at 50° C. for 1 hour The resulting mixture was heated to 135° C. the mixture was cooled to 0° C. After ethyl acetate extraction the organic layer was dried over magnesium sulfate The solvent was distilled off under reduced pressure the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate)

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

Procedure: A suspension of 85% potassium hydroxide (36.6 g), and tetrabutylammonium bromide (9.1 g) in toluene (400 ml) was refluxed overnight in a Dean Stalk apparatus. Then, a solution of 2-piperidone (50.0 g) and iodoisobutane (120.7 g) in toluene (150 ml) was added dropwise at 115° C. to the solution above. After the dropwise addition, the mixture was refluxed further for 2.5 hours, and then cooled, and filtered to remove insoluble matter. The filtrate was washed with water, and the aqueous layer was extracted with toluene. The organic layers were combined and dried over magnesium sulfate. After distilling off the solvent under reduced, the residue was separated and purified by silica gel column chromatography (ethyl acetate) to obtain yellow oil of 1-isobutyl-2-piperidone (9.3 g). was refluxed overnight in a Dean Stalk apparatus After the dropwise addition the mixture was refluxed further for 2.5 hours cooled filtered to remove insoluble matter The filtrate was washed with water the aqueous layer was extracted with toluene dried over magnesium sulfate After distilling off the solvent the residue was separated purified by silica gel column chromatography (ethyl acetate)

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

Procedure: A suspension of 85% potassium hydroxide (36.6 g), and tetrabutylammonium bromide (9.1 g) in toluene (400 ml) was refluxed overnight in a Dean Stalk apparatus. Then, a solution of 2-piperidone (50.0 g) and iodoisobutane (120.7 g) in toluene (150 ml) was added dropwise at 115° C. to the solution above. After the dropwise addition, the mixture was refluxed further for 2.5 hours, and then cooled, and filtered to remove insoluble matter. The filtrate was washed with water, and the aqueous layer was extracted with toluene. The organic layers were combined and dried over magnesium sulfate. After distilling off the solvent under reduced, the residue was separated and purified by silica gel column chromatography (ethyl acetate) to obtain yellow oil of 1-isobutyl-2-piperidone (9.3 g). was refluxed overnight in a Dean Stalk apparatus After the dropwise addition the mixture was refluxed further for 2.5 hours cooled filtered to remove insoluble matter The filtrate was washed with water the aqueous layer was extracted with toluene dried over magnesium sulfate After distilling off the solvent the residue was separated purified by silica gel column chromatography (ethyl acetate)

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

Procedure: A suspension of 85% potassium hydroxide (36.6 g), and tetrabutylammonium bromide (9.1 g) in toluene (400 ml) was refluxed overnight in a Dean Stalk apparatus. Then, a solution of 2-piperidone (50.0 g) and iodoisobutane (120.7 g) in toluene (150 ml) was added dropwise at 115° C. to the solution above. After the dropwise addition, the mixture was refluxed further for 2.5 hours, and then cooled, and filtered to remove insoluble matter. The filtrate was washed with water, and the aqueous layer was extracted with toluene. The organic layers were combined and dried over magnesium sulfate. After distilling off the solvent under reduced, the residue was separated and purified by silica gel column chromatography (ethyl acetate) to obtain yellow oil of 1-isobutyl-2-piperidone (9.3 g). was refluxed overnight in a Dean Stalk apparatus After the dropwise addition the mixture was refluxed further for 2.5 hours cooled filtered to remove insoluble matter The filtrate was washed with water the aqueous layer was extracted with toluene dried over magnesium sulfate After distilling off the solvent the residue was separated purified by silica gel column chromatography (ethyl acetate)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-isobutyl-2-piperidone (8.8 g) and aqueous methanesulfonic acid solution (10.9 g/19 ml) was refluxed at 110° C. for 3 days. To the mixture which was previously cooled to room temperature, were added water (10 ml) and sodium carbonate (18.0 g) slowly. Then, after heating the mixture at 50° C. for 1 hour, DMSO (13 ml) was added. The resulting mixture was heated to 135° C., and then a solution of 5-bromo-2-fluorobenzaldehyde (11.5 g) in DMSO (15 ml) was added dropwise. After stirring at 135° C. for 6 hours, the mixture was cooled to 0° C., and the mixture was adjusted to pH 2.5 by using 6N hydrochloric acid. After ethyl acetate extraction, the organic layer was dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate) to obtain brown oil of 5-(4-bromo-2-formyl-N-isobutylanilino)pentanoic acid (15.3 g). To the mixture which was previously cooled to room temperature Then, after heating the mixture at 50° C. for 1 hour The resulting mixture was heated to 135° C. the mixture was cooled to 0° C. After ethyl acetate extraction the organic layer was dried over magnesium sulfate The solvent was distilled off under reduced pressure the residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to ethyl acetate)