4-hydroxy-4-methylcyclohexan-1-one

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

Procedure: To a cooled (0° C.) solution of 4-hydroxy-4-methylcyclohexanone (1 equiv) in methanol (0.5 M) was added sodium borohydride (2 equiv).The resulting mixture was stirred at room temperature overnight. After the reaction was complete, the resulting mixture was quenched with water and extracted with ethyl acetate. The organic layers were combined, washed with brine (20 mL), dried over sodium sulfate, filtered and concentrated. The crude product was purified by silica gel flash column chromatography (0-10% DCM in methanol) to afford the title compound as a white solid (87% yield, cis/trans mixture). 1H NMR (300 MHz, DMSO-d6) δ ppm 4.34-4.32 (d, J=4.5 Hz, 1H), 4.29-4.27 (d, J=3.6 Hz, 0.45H), 4.12-4.06 (m, 0.47H), 4.00 (s, 0.39H), 3.97 (s, 1H), 3.82 (s, 0.48H), 3.55-3.50 (m, 0.47H), 3.20-3.17 (d, J=7.5 Hz, 1H), 1.76-1.62 (m, 1H), 1.60-1.40 (m, 8H), 1.35-1.20 (m, 4H), 1.07 (s, 1.5H), 1.05 (s, 3H). resulting mixture the resulting mixture was quenched with water extracted with ethyl acetate washed with brine (20 mL) dried over sodium sulfate filtered concentrated The crude product was purified by silica gel flash column chromatography (0-10% DCM in methanol)

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

Procedure: To a solution of 8-methyl-1,4-dioxaspiro[4.5]decan-8-ol (1 equiv) in a 2:1 mixture of acetone and water (0.38 M) was added pyridinium p-toluenesulfonate (0.2 equiv).The resulting mixture was refluxed for 8 h. After the reaction was complete, the reaction mixture was cooled to room temperature and concentrated. The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether) to afford the title compound (86% yield) as a yellow solid. 1H NMR (400 MHz, CHLOROFORM-d1) δ ppm 3.96-3.93 (m, 2H), 2.27-2.25 (m, 1H), 2.25-2.22 (m, 1H), 2.01-1.94 (m, 2H), 1.90-1.82 (m, 2H), 1.38 (s, 3H). resulting mixture was refluxed for 8 h concentrated The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether)

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

Procedure: To a solution of 8-methyl-1,4-dioxaspiro[4.5]decan-8-ol (1 equiv) in a 2:1 mixture of acetone and water (0.38 M) was added pyridinium p-toluenesulfonate (0.2 equiv).The resulting mixture was refluxed for 8 h. After the reaction was complete, the reaction mixture was cooled to room temperature and concentrated. The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether) to afford the title compound (86% yield) as a yellow solid. 1H NMR (400 MHz, CHLOROFORM-d1) δ ppm 3.96-3.93 (m, 2H), 2.27-2.25 (m, 1H), 2.25-2.22 (m, 1H), 2.01-1.94 (m, 2H), 1.90-1.82 (m, 2H), 1.38 (s, 3H). resulting mixture was refluxed for 8 h concentrated The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether)

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

Procedure: 4-hydroxy-4-methylcyclohexanone (270 mg, 1.48 mmol) was dissolved in 1,2-dichloroethane (8.3 ml), followed by sequential addition of benzylamine (0.2 ml, 1.83 mmol), NaBH(OAc)3 (560 mg, 2.66 mmol), and acetic acid (0.1 ml, 1.66 mmol), and then the resulting mixture was stirred at room temperature under nitrogen stream for 72 hours. The resulting reaction liquid was neutralized by addition of 10% aqueous NaOH solution, and extracted with 5% MeOH/MC (50 ml×3). The organic layer was dried over anhydrous sodium sulfate, followed by filtration and concentration, and then the residue thus obtained was subjected to MPLC (10% MeOH/MC), to obtain 350 mg of yellow solid (96%). The resulting reaction liquid extracted with 5% MeOH/MC (50 ml×3) The organic layer was dried over anhydrous sodium sulfate followed by filtration and concentration the residue thus obtained

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

Procedure: 4-Hydroxy-4-methylcyclohexanone (440 mg, 3.43 mmol) was dissolved in 1,2-dichloroethane (15 ml), followed by sequential addition of cyclopropylamine (0.26 ml, 3.78 mmol), NaBH(OAc)3 (1.16 g, 5.49 mmol), and acetic acid (0.20 ml, 3.43 mmol), and then the resulting mixture was stirred at room temperature under nitrogen stream for 20 hours. The resulting reaction liquid was neutralized by addition of 10% aqueous NaOH solution, and extracted with 5% MeOH/MC (15 ml×4). The organic layer was dried over anhydrous sodium sulfate, followed by filtration, concentration, and vacuum drying, to obtain 417 mg of yellow solid (72%). The resulting reaction liquid extracted with 5% MeOH/MC (15 ml×4) The organic layer was dried over anhydrous sodium sulfate followed by filtration, concentration, and vacuum drying

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

Procedure: 8-Methyl-1,4-dioxaspiro[4.5]decane-8-ol (650 mg, 3.77 mmol) was dissolved in THF (10 ml), followed by addition of 1N aqueous HCl solution (5 ml), and then the resulting mixture was stirred at room temperature for 6 hours. The resulting reaction liquid was concentrated under reduced pressure, and then extracted with 10% MeOH/MC (20 ml×5). The organic layer was dried over anhydrous sodium sulfate, followed by filtration and concentration, and then the residue thus obtained was subjected to MPLC (50% EtOAc/Hexanes), to obtain 443 mg of yellow oil (92%). The resulting reaction liquid was concentrated under reduced pressure extracted with 10% MeOH/MC (20 ml×5) The organic layer was dried over anhydrous sodium sulfate followed by filtration and concentration the residue thus obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of trimethyl phosphonoacetate (9.11 mL, 56 mmol) and (40 mL, 64 mmol) of n-BuLi (1.6N) in DME (60 mL) is stirred for 10 minutes at 0° C. 4-Hydroxy-4-methyl-cyclohexanone (8 g, 56 mmol) was added and the mixture stirred 2.5 hours at 0° C. until TCL indicated complexion of the reaction. Product was obtained after extraction with dichloromethane (7.71 g, 69%). the mixture stirred 2.5 hours at 0° C. until TCL complexion of the reaction Product was obtained after extraction with dichloromethane (7.71 g, 69%)

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

Procedure: To a cooled (0° C.) solution of 4-hydroxy-4-methylcyclohexanone (1 equiv) in methanol (0.5 M) was added sodium borohydride (2 equiv).The resulting mixture was stirred at room temperature overnight. After the reaction was complete, the resulting mixture was quenched with water and extracted with ethyl acetate. The organic layers were combined, washed with brine (20 mL), dried over sodium sulfate, filtered and concentrated. The crude product was purified by silica gel flash column chromatography (0-10% DCM in methanol) to afford the title compound as a white solid (87% yield, cis/trans mixture). 1H NMR (300 MHz, DMSO-d6) δ ppm 4.34-4.32 (d, J=4.5 Hz, 1H), 4.29-4.27 (d, J=3.6 Hz, 0.45H), 4.12-4.06 (m, 0.47H), 4.00 (s, 0.39H), 3.97 (s, 1H), 3.82 (s, 0.48H), 3.55-3.50 (m, 0.47H), 3.20-3.17 (d, J=7.5 Hz, 1H), 1.76-1.62 (m, 1H), 1.60-1.40 (m, 8H), 1.35-1.20 (m, 4H), 1.07 (s, 1.5H), 1.05 (s, 3H). resulting mixture the resulting mixture was quenched with water extracted with ethyl acetate washed with brine (20 mL) dried over sodium sulfate filtered concentrated The crude product was purified by silica gel flash column chromatography (0-10% DCM in methanol)

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

Procedure: To a solution of 8-methyl-1,4-dioxaspiro[4.5]decan-8-ol (1 equiv) in a 2:1 mixture of acetone and water (0.38 M) was added pyridinium p-toluenesulfonate (0.2 equiv).The resulting mixture was refluxed for 8 h. After the reaction was complete, the reaction mixture was cooled to room temperature and concentrated. The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether) to afford the title compound (86% yield) as a yellow solid. 1H NMR (400 MHz, CHLOROFORM-d1) δ ppm 3.96-3.93 (m, 2H), 2.27-2.25 (m, 1H), 2.25-2.22 (m, 1H), 2.01-1.94 (m, 2H), 1.90-1.82 (m, 2H), 1.38 (s, 3H). resulting mixture was refluxed for 8 h concentrated The residue was purified by silica gel chromatography (0-30% ethyl acetate in petroleum ether)

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

Procedure: To a stirred solution of methyl 3-amino-2-methylbenzoate (1.5 g, 9.1 mmol) and 4-hydroxy-4-methylcyclohexanone (1.51 ml, 11.8 mmol) in 10 ml of dichloroethane was added acetic acid (3.2 mL, 55 mmol) and the reaction mixture stirred at room temperature for 20 minutes. The reaction mixture was cooled to 0° C. and sodium triacetoxyborohydride (5.78 g, 27.3 mmol) was added and the mixture stirred at room temperature overnight. The reaction mixture was neutralized with sat. NaHCO3, extracted with DCM, dried over Na2SO4, concentrated under reduced pressure, and purified by silica gel column chromatography to afford the title compound which was carried forward as a mixture of cis and trans isomers (1.4 g, 56%). The reaction mixture was cooled to 0° C. the mixture stirred at room temperature overnight extracted with DCM dried over Na2SO4 concentrated under reduced pressure purified by silica gel column chromatography

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

Procedure: To a stirred solution of methyl 3-amino-2-methylbenzoate (1.5 g, 9.1 mmol) and 4-hydroxy-4-methylcyclohexanone (1.51 ml, 11.8 mmol) in 10 ml of dichloroethane was added acetic acid (3.2 mL, 55 mmol) and the reaction mixture stirred at room temperature for 20 minutes. The reaction mixture was cooled to 0° C. and sodium triacetoxyborohydride (5.78 g, 27.3 mmol) was added and the mixture stirred at room temperature overnight. The reaction mixture was neutralized with sat. NaHCO3, extracted with DCM, dried over Na2SO4, concentrated under reduced pressure, and purified by silica gel column chromatography to afford the title compound which was carried forward as a mixture of cis and trans isomers (1.4 g, 56%). The reaction mixture was cooled to 0° C. the mixture stirred at room temperature overnight extracted with DCM dried over Na2SO4 concentrated under reduced pressure purified by silica gel column chromatography

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

Procedure: To a mixture of 4-hydroxy-4-methylcyclohexanone (4.1 g, 32.0 mmol) and benzyl amine (6.8 g, 64.0 mmol) in 1,2-dichloroethane (120 mL) was added acetic acid (3.84 g, 64.0 mmol). After the resulting mixture was stirred at RT for 2 hours, the mixture was added NaBH(OAc)3 (13.6 g, 64.0 mmol). The resulting mixture was then stirred at RT overnight. After the reaction was completed, the mixture was basified to pH 11 by addition of 2 N NaOH. The separated organic layer was concentrated in vacuo and the residue was purified by column chromatography on silica gel (MeOH:DCM=3:100 to 1:10) to afford 4-(benzylamino)-1-methylcyclohexanol as a white solid (5.7 g, yield: 80.0%). The resulting mixture was then stirred at RT overnight The separated organic layer was concentrated in vacuo the residue was purified by column chromatography on silica gel (MeOH:DCM=3:100 to 1:10)