4-[(1-methylpiperidin-4-yl)methoxy]aniline

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:

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5,8-dibromo-imidazo[1,2-a]pyrazine (0.100 g, 0.36 mmol) in isopropanol (5 mL) are added 1,4-diazabicyclo[2,2,2]octane (DABCO) (0.036 mL, 0.36 mmol) and 4-(1-methyl-piperidin-4-ylmethoxy)-phenylamine (79.6 mg, 0.36 mmol). The reaction mixture is stirred at 90° C. overnight. The solvent is evaporated and the residue chromatographed on silica gel column eluting with 97:3 followed by 94:6 and 90:10 DCM:MeOH. The title compound is obtained as a solid (20 mg, 13%). LCMS: Rt 2.30 min (94%), m/z (APCI) 417. The solvent is evaporated the residue chromatographed on silica gel column eluting with 97:3

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

Procedure: In the same way as described for Compound 150, step 1, using 1-methyl-4-(4-nitro-phenoxymethyl)-piperidine (0.65 g, 2.6 mmol) in ethanol (40 mL) and palladium hydroxide (0.182 g, 0.26 mmol). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM and a 80:20 mixture DCM:MeOH. The title compound was obtained as a white solid (0.402 g, 70%). 1H-NMR (400 MHz, CDCl3) δ (ppm) 1.30-1.51 (2H, m), 1.65-1.88 (3H, m), 1.89-2.09 (2H, t), 2.29 (3H, s), 2.90 (2H, d), 3.45 (2H, br s), 3.73 (2H, d), 6.67 (2H, d), 6.75 (2H, d). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5,8-dibromo-imidazo[1,2-a]pyrazine (0.100 g, 0.36 mmol) in isopropanol (5 mL) are added 1,4-diazabicyclo[2,2,2]octane (DABCO) (0.036 mL, 0.36 mmol) and 4-(1-methyl-piperidin-4-ylmethoxy)-phenylamine (79.6 mg, 0.36 mmol). The reaction mixture is stirred at 90° C. overnight. The solvent is evaporated and the residue chromatographed on silica gel column eluting with 97:3 followed by 94:6 and 90:10 DCM:MeOH. The title compound is obtained as a solid (20 mg, 13%). LCMS: Rt 2.30 min (94%), m/z (APCI) 417. The solvent is evaporated the residue chromatographed on silica gel column eluting with 97:3

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

Procedure: In the same way as described for Compound 150, step 1, using 1-methyl-4-(4-nitro-phenoxymethyl)-piperidine (0.65 g, 2.6 mmol) in ethanol (40 mL) and palladium hydroxide (0.182 g, 0.26 mmol). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM and a 80:20 mixture DCM:MeOH. The title compound was obtained as a white solid (0.402 g, 70%). 1H-NMR (400 MHz, CDCl3) δ (ppm) 1.30-1.51 (2H, m), 1.65-1.88 (3H, m), 1.89-2.09 (2H, t), 2.29 (3H, s), 2.90 (2H, d), 3.45 (2H, br s), 3.73 (2H, d), 6.67 (2H, d), 6.75 (2H, d). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM

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

Procedure: To a stirred solution of 4-((1-methylpiperidin-4-yl)methoxy)phenylamine (25) (2.00 g, 9.08 mmol) in water (19 mL) and concentrated HCl (6 mL) was added dropwise a solution of NaNO2 (689 mg, 9.99 mmol) in water (2 mL) at 0° C., and stirring was continued for 50 min at 0° C. (solution A). Ethyl 2-methylacetoacetate (1.39 mL, 9.53 mmol) was added dropwise to a stirred suspension of NaOAc (7.8 g) in EtOH (15 mL) at 0° C. and stirring was continued for 30 min at this temperature; then ice (9 g) was added (solution B). Solution A was added to solution B by a transfer cannula at 0° C. and the mixture was allowed to warm to room temperature. After 2.5 h the reaction mixture was basified by slow addition of a saturated aqueous solution of Na2CO3 at 0° C. and extracted with CH2Cl2 (3×100 mL). The combined organic layers were washed with water (200 mL), dried (MgSO4), and the solvent was removed in vacuo. The residue was then dissolved in absolute EtOH (10 mL), treated with a freshly prepared saturated solution of HCl in absolute EtOH (10 mL) and heated at reflux for 50 min. After cooling to room temperature the solvent was removed under reduced pressure and the residue was partitioned between water (50 mL) and CH2Cl2 (100 mL). The aqueous layer was basified using a saturated aqueous solution of Na2CO3 and extracted with CH2Cl2 (3×100 mL). The combined organic layers were washed with brine (200 mL), dried (MgSO4), and concentrated in vacuo. Purification by crystallization from iPr2O and column chromatography (CH2Cl2/MeOH, 30:1, 2% NEt3) of the residue obtained after evaporation of the mother liquor provided 26 (2.06 g, 72% overall yield) as a yellow solid. 1H NMR (300 MHz, CDCl3): δ=1.36-1.54 (m, 5 H, OCH2CH3, 3′-Hax, 5′-Hax), 1.73-2.06 (m, 5 H, 2-Hax, 3′-Heq, 4′-H, 5′-Heq, 6′-Hax), 2.30 (s, 3 H, NMe), 2.87-2.97 (m, 2 H, 2′-Heq, 6′-Heq), 3.83 (d, J=6.2 Hz, 2 H, ArOCH2), 4.40 (q, J=7.2 Hz, 2H, OCH2CH3), 6.98 (dd, J=8.9, 2.4 Hz, 1 H, 6-H), 7.05 (d, J=2.0 Hz, 1 H, 3-H), 7.12 (mc, 1 H, 4-H), 7.30 (d, J=8.9 Hz, 1 H, 7-H), 9.11 (sbr, 1 H, NH) ppm. —13C NMR (50.3 MHz, CDCl3): δ=14.4 (OCH2CH3), 29.2 (C-3′, C-5), 35.3 (C-4′), 46.4 (NMe), 55.5 (C-2′, C-6′), 60.9 (OCH2CH3), 73.2 (ArOCH2), 103.4 (C-4), 108.1 (C-3), 112.7 (C-7), 117.2 (C-6), 127.8 (C-2, C-3a), 132.2 (C-7a), 154.1 (C-5), 162.0 (C═O) ppm. −MS (70 eV, EI): m/z (%)=316 (6) [M]+, 112 (100) [C7H14N]+. —C18H24N2O3 (316.39): calcd. C, 68.33; H, 7.65; found C, 68.03; H, 7.84. stirring was continued for 30 min at this temperature extracted with CH2Cl2 (3×100 mL) The combined organic layers were washed with water (200 mL) dried (MgSO4) the solvent was removed in vacuo The residue was then dissolved in absolute EtOH (10 mL) treated with a freshly prepared saturated solution of HCl in absolute EtOH (10 mL) heated at reflux for 50 min After cooling to room temperature the solvent was removed under reduced pressure the residue was partitioned between water (50 mL) and CH2Cl2 (100 mL) extracted with CH2Cl2 (3×100 mL) The combined organic layers were washed with brine (200 mL) dried (MgSO4) concentrated in vacuo Purification by crystallization from iPr2O and column chromatography (CH2Cl2/MeOH, 30:1, 2% NEt3) of the residue obtained after evaporation of the mother liquor

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

Procedure: A solution of 1-methyl-4-(4-nitrophenoxymethyl)piperidine (24) (1.0 g, 4.0 mmol), MeOH (20 mL), and concentrated HCl (1 mL) was hydrogenated over Pd/C (10%, 100 mg) at 58 psi H2 for 1 h at room temperature. Then, the solid was removed by filtration through Celite, which was washed thoroughly with MeOH (200 mL), and the filtrate was concentrated in vacuo. The residue was dissolved in water (50 mL) and the resulting solution was adjusted to pH 10 with a saturated aqueous solution of NaHCO3 and 2 M NaOH. The mixture was extracted with CH2Cl2 (3×100 mL), dried (MgSO4), and the solvent was removed in vacuo. Purification by column chromatography (CH2Cl2/MeOH, 10:1, 2% NEt3) gave 25 (0.72 g, 82%) as a reddish brown solid. 1H NMR (300 MHz, CDCl3): δ=1.31-1.48 (m, 2 H, 3′-Hax, 5′-Hax), 1.66-1.89 (m, 3 H, 3′-Heq, 4′-H, 5′-Heq), 1.96 (dt, J=11.9, 2.3 Hz, 2 H, 2′-Hax, 6′-Hax), 2.28 (s, 3 H, NMe), 2.84-2.93 (m, 2 H, 2′-Heq, 6′-Heq), 3.41 (sbr, 2 H, NH2), 3.73 (d, J=6.4 Hz, 2 H, OCH2), 6.60-6.67 (m, 2 H, 3-H, 5-H), 6.70-6.76 (m, 2 H, 2-H, 6-H) ppm. —13C NMR (75.5 MHz, CDCl3): δ=29.1 (C-3′, C-5′), 35.3 (C-4′), 46.4 (NMe), 55.4 (C-2′, C-6′), 73.2 (OCH2), 115.4 (C-3, C-5), 116.3 (C-2, C-6), 139.8 (C-1), 152.2 (C-4) ppm. −MS (70 eV, EI): m/z (%)=220 (3) [M]+, 112 (100) [C7H14N]+. —C13H20N2O (220.31): calcd. C, 70.87; H, 9.15; found C, 70.50; H, 8.94. Then, the solid was removed by filtration through Celite, which was washed thoroughly with MeOH (200 mL) the filtrate was concentrated in vacuo The residue was dissolved in water (50 mL) The mixture was extracted with CH2Cl2 (3×100 mL) dried (MgSO4) the solvent was removed in vacuo Purification by column chromatography (CH2Cl2/MeOH, 10:1, 2% NEt3)

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5,8-dibromo-imidazo[1,2-a]pyrazine (0.100 g, 0.36 mmol) in isopropanol (5 mL) are added 1,4-diazabicyclo[2,2,2]octane (DABCO) (0.036 mL, 0.36 mmol) and 4-(1-methyl-piperidin-4-ylmethoxy)-phenylamine (79.6 mg, 0.36 mmol). The reaction mixture is stirred at 90° C. overnight. The solvent is evaporated and the residue chromatographed on silica gel column eluting with 97:3 followed by 94:6 and 90:10 DCM:MeOH. The title compound is obtained as a solid (20 mg, 13%). LCMS: Rt 2.30min (94%), m/z (APCI) 417. The solvent is evaporated the residue chromatographed on silica gel column eluting with 97:3

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

Procedure: In the same way as described for Compound 150, step 1, using 1-methyl-4-(4-nitro-phenoxymethyl)-piperidine (0.65 g, 2.6 mmol) in ethanol (40 mL) and palladium hydroxide (0.182 g, 0.26 mmol). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM and a 80:20 mixture DCM:MeOH. The title compound was obtained as a white solid (0.402 g, 70%). 1H-NMR (400 MHz, CDCl3) δ (ppm) 1.30-1.51 (2H, m), 1.65-1.88 (3H, m), 1.89-2.09 (2H, t), 2.29 (3H, s), 2.90 (2H, d,), 3.45 (2H, br s), 3.73 (2H, d), 6.67 (2H, d), 6.75 (2H, d). Filtration over Celite 521 and evaporation gave a red oil that was purified by silica gel column chromatography eluting with DCM