(2,3-dimethoxyphenyl)-piperidin-4-ylmethanol

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

Procedure: 4-(2,3-Dimethoxybenzoyl)pyridine (12) (10.09 g, 42 mmol) was dissolved in 100 mL of methanol and hydrogenated using a 5% rhodium on carbon catalyst. At the conclusion of the reaction, the catalyst was removed by filtration. The filtrate weighed 113.90 g. The reactor and catalyst cake were washed with methanol. The combined washes weighed 165.26 g. At the conclusion of the reaction the catalyst was removed by filtration The reactor and catalyst cake were washed with methanol

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

Procedure: A solution of 4-(2,3-dimethoxybenzoyl)pyridine (12) (2.10 g, 8.6 mmol) in MeOH (10 mL) is treated with 5% Rh/alumina (0.72 g). The mixture is hydrogenated in a Parr shaker at 55 psig for 22 hours. After filtration through Celite7 filter aid, the filtrate is concentrated at reduced pressure to give the title compound (11) as a solid (2.0 g, 92% yield). After filtration through Celite7 filter aid the filtrate is concentrated at reduced pressure

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

Procedure: Dissolve 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11) (11.0 g, 43.8 mmol) and 17.0 g (40.1 mmol) (2R,3R)-(−)-di-(p-anisoyl)tartaric acid in 400 mL refluxing isopropanol. Allow the mixture to cool to room temperature. Collect the precipitate, rinse with isopropanol and dry to give the (R)-α-(2,3-dimethoxyphenyl)-4-piperidinemethanol, (2R,3R)-(−)-di-(p-anisoyl)tartaric acid. Recrystallize the (R)-α-(2,3-dimethoxyphenyl)-4-piperidinemethanol, (2R,3R)-(−)-di-(p-anisoyl)tartaric acid salt from 250 mL isopropanol. Collect the precipitate rinse with isopropanol dry

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

Procedure: Into a suitable inerted reactor was charged 118 kg (481 mol) of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) as a toluene wet cake and 23.6 kg of 5% rhodium on carbon catalyst at 25° C. To the slurry was then added 850 kg of methanol and 29 kg of glacial acetic acid. The reactor was then pressurized to about 100 psi with hydrogen for about 4-12 hours1 at 40° C. The catalyst was removed by filtration and the reactor and the catalyst were rinsed with 150 kg of methanol.2 The reactor rinse filtrate and the reaction mixture filtrate were combined. The concentration of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11) is typically about 10 wt %, affording about 116 kg of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11) (96% yield)3. The catalyst was removed by filtration the reactor and the catalyst were rinsed with 150 kg of methanol 2 The reactor rinse filtrate

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

Procedure: A suitable inert reactor is charged with 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) (13.6 kg, 55.5 mol) as a toluene wet cake and 5% rhodium on carbon catalyst (2.7 kg, 50% wet with water) as a water wet cake at about 25° C. About 190 kg of methanol is added and the reactor is pressured to about 100 psig with hydrogen for about 4-12 hours at about 50° C. The catalyst is removed by filtration and the reactor and catalyst are rinsed with about 7 kg of methanol. Deionized water is used as a final wash of the catalyst wet cake. The reactor rinse filtrate and the reaction mixture filtrate are combined. The concentration of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11) is about 7 wt %, affording about 13 kg (90% average yield) of the title compound (11). The catalyst is removed by filtration the reactor and catalyst are rinsed with about 7 kg of methanol a final wash of the catalyst wet cake The reactor rinse filtrate affording

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1-L Parr reactor was charged with 12.43 g (0.051 mol) of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10), 5.74 g of a 5% Rhodium on Carbon catalyst, and 237 g of methanol. The solution was warmed to 40° C. and treated with 100 psi of hydrogen for 5.5 h. When the reaction was complete, the solution was filtered and the catalyst washed with 108 g of methanol which was added to the filtrate. The weight of the filtered solution was 310.45 g. The methanol solution was assayed for the title compound using high pressure liquid chromatography. The methanol solution was found to contain 3.7% title compound by weight. This corresponds to 11.5 g (90% yield) of title compound. the solution was filtered the catalyst washed with 108 g of methanol which was added to the filtrate

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

Procedure: 4-[1-Hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) (10.1 g, 41 mmol) was dissolved in 100 mL of methanol and hydrogenated using a 5% rhodium on carbon catalyst. At the conclusion of the reaction, the catalyst was removed by filtration. The filtrate weighed 111.51 g. The reactor and catalyst cake were washed with methanol. The combined washes weighed 170.27 g and contained 7.6% of the title compound (11). At the conclusion of the reaction the catalyst was removed by filtration The reactor and catalyst cake were washed with methanol

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

Procedure: In Scheme N, step b, the pyridine functionality of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) is reduced to give 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11) as described previously in Scheme F, step e.

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

Procedure: In Scheme F, step g, the pyridine and ketone functionality's of 4-(2,3-dimethoxybenzoyl)pyridine (12) are reduced to give 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11).

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

Procedure: In Scheme F, step e, the pyridine functionality of 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]pyridine (10) is reduced to give 4-[1-hydroxy-1-(2,3-dimethoxyphenyl)methyl]piperidine (11).

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

Procedure: 4-(2,3-Dimethoxybenzoyl)pyridine (12) (10.09 g, 42 mmol) was dissolved in 100 mL of methanol and hydrogenated using a 5% rhodium on carbon catalyst. At the conclusion of the reaction, the catalyst was removed by filtration. The filtrate weighed 113.90 g. The reactor and catalyst cake were washed with methanol. The combined washes weighed 165.26 g. At the conclusion of the reaction the catalyst was removed by filtration The reactor and catalyst cake were washed with methanol

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

Procedure: A solution of 4-(2,3-dimethoxybenzoyl)pyridine (12) (2.10 g, 8.6 mmol) in MeOH (10 mL) is treated with 5% Rh/alumina (0.72 g). The mixture is hydrogenated in a Parr shaker at 55 psig for 22 hours. After filtration through Celite7 filter aid, the filtrate is concentrated at reduced pressure to give the title compound (11) as a solid (2.0 g, 92% yield). After filtration through Celite7 filter aid the filtrate is concentrated at reduced pressure