methyl 1,2,3,6-tetrahydropyridine-5-carboxylate;hydrochloride

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

Procedure: A mixture of 5.0 g. (0.0282 mole) of 1,2,5,6-tetrahydro-3-pyridinecarboxylic acid methyl ester, hydrochloride, 8.08 g. (0.282 mole) of 4,4-diphenyl-3-butenyl bromide and 10 g. of crushed potassium carbonate was refluxed in 200 ml. of acetone for 15 hours. The reaction mixture was evaporated, extracted into ethyl acetate from water, dried, evaporated and chromatographed on silica (dry column) eluted with hexane/hexane:ethyl acetate to give 1,2,5,6-tetrahydro-1-(4,4-diphenyl-3-butenyl)-3-pyridinecarboxylic acid methyl ester hydrochloride. A mixture of 5.0 g The reaction mixture was evaporated extracted into ethyl acetate from water dried evaporated chromatographed on silica (dry column) eluted with hexane/hexane

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

Procedure: To 7.338 g (41.31 mol) of guvacoline hydrochloride (Arzneim. Forsch. 1989, 39(5), 539. ) in dioxane (100 ml) was added 5-chloro-dibenzosuberane (14.933 g, 65.39 mmol), Nal (catalytic, ˜1 g), and triethylamine (17 mL, 122.0 mmol) to give a brown heterogeneous slurry that was heated at 90° C. overnight. The solvent was then concentrated and the resultant sludge was taken up in ethyl acetate and sequentially washed with Na2HPO4 buffer (pH 4), Na2CO3 (saturated aqueous), and brine. The organics were then dried over Na2SO4 and concentrated, resulting in a brown solid which was purified by chromatography on silica gel eluting with 1-5% ethyl acetate/hexanes to give 1-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid methyl ester as a white solid (9.584 g, 28.74 mmol, 67%). 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 2.22 (dt, J=9.28, 2.68 Hz, 2H) 2.41 (t, J=5.56 Hz, 2H) 2.73-2.83 (m, 2H) 2.99-3.05 (m, 2H) 3.65 (s, 3 H) 3.90-4.00 (m, 2H) 4.11 (s, 1H) 6.94-6.99 (m, J=3.98, 3.98, 1.89, 1.77 Hz, 1 H) 7.05-7.11 (m, 4H) 7.13-7.21 (m, 4H). to give a brown heterogeneous slurry that The solvent was then concentrated sequentially washed with Na2HPO4 buffer (pH 4), Na2CO3 (saturated aqueous), and brine The organics were then dried over Na2SO4 concentrated resulting in a brown solid which was purified by chromatography on silica gel eluting with 1-5% ethyl acetate/hexanes

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

Procedure: A mixture of methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (crude, 150 mmol), 5-chlorodibenzosuberane (41 g, 180 mmol, 1.2 eq), sodium iodide (2.2 g, 15 mmol, 0.1 eq) and triethylamine (63 mL, 450 mmol, 3.0 eq) in dioxane (300 mL) was stirred at 90° C. overnight. The reaction mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over MgSO4, and concentrated. The crude product was passed through a silica gel plug, eluting with CH2Cl2. After concentration, the resulting solid was triturated with ether to yield 27 g (55%) of methyl 1-(10,11-dihydro5H-dibenzo[a,d][7]annulen-5-yl)-1,2,5,6-tetrahydropyridine-3-carboxylate. The reaction mixture was concentrated in vacuo the residue was partitioned between ethyl acetate and water The organic phase was washed with brine dried over MgSO4 concentrated eluting with CH2Cl2 After concentration the resulting solid was triturated with ether

Conditions: temp:57.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Arecoline hydrobromide (25 g, 106 mmol) was neutralized with sodium carbonate (12.8 g, 120 mmol, 1.1 eq) in water (200 mL) for 30 min. The neutralized product was dissolved in toluene (50 mL) and added dropwise to a solution of triphosgene (16.3 g, 54.9 mmol, 0.52 eq) in toluene (100 mL) at 0° C. The resulting mixture was heated at 55-60° C. overnight. The reaction mixture was then concentrated in vacuo and the residue was dissolved in water (300 mL) and heated at 80° C. for 3 h. The water was evaporated and chased with toluene 3 times. The crude methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride, obtained as a thick brown oil, was used as is in the next reaction. The reaction mixture was then concentrated in vacuo the residue was dissolved in water (300 mL) heated at 80° C. for 3 h The water was evaporated

Conditions: temp:57.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Arecoline hydrobromide (25 g, 106 mmol) was neutralized with sodium carbonate (12.8 g, 120 mmol, 1.1 eq) in water (200 mL) for 30 min. The neutralized product was dissolved in toluene (50 mL) and added dropwise to a solution of triphosgene (16.3 g, 54.9 mmol, 0.52 eq) in toluene (100 mL) at 0° C. The resulting mixture was heated at 55-60° C. overnight. The reaction mixture was then concentrated in vacuo and the residue was dissolved in water (300 mL) and heated at 80° C. for 3 h. The water was evaporated and chased with toluene 3 times. The crude methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride, obtained as a thick brown oil, was used as is in the next reaction. The reaction mixture was then concentrated in vacuo the residue was dissolved in water (300 mL) heated at 80° C. for 3 h The water was evaporated

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Hydroxybenzaldehyde (1.34 g.) and sodium cyanoborohydride (0.7 g.) were added to a solution of methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (3.1 g.) in methanol (30 ml.). The mixture was stirred for 3 days at 25° C., evaporated and water (30 ml.) added to the residue followed by concentrated hydrochloric acid to pH 1. This mixture was extracted with ether (2×20 ml.) and the extracts discarded. The aqueous phase was basified to pH 9 with 10% w/v sodium carbonate solution and then extracted with ether (2×30 ml.). The combined extracts were dried (MgSO4) and evaporated. The oil obtained was dissolved in acetone and treated with a slight excess of ethereal hydrogen chloride. The solid which was precipitated was collected by filtration to give methyl 1-(4-hydroxybenzyl)-1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (2.05 g.). A portion was recrystallised from methanol and acetone to give pure material of m.p. 212°-214° C. (dec.). evaporated water (30 ml.) added to the residue This mixture was extracted with ether (2×20 ml.) extracted with ether (2×30 ml.) The combined extracts were dried (MgSO4) evaporated The oil obtained The solid which was precipitated was collected by filtration

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

Procedure: Triethylamine (2.2 g.) and 2-chlorobenzyl chloride (1.63 g.) were added to a solution of methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (1.63 g.) in methanol (10 ml.). The solution obtained was kept for 24 hours at 20°-25° C. and then evaporated. Water (20 ml.) and 10% w/v sodium carbonate solution were then added to the residue to give a mixture of pH 10. This mixture was extracted with ether (2×20 ml.). The combined extracts were washed with water, dried (MgSO4) and evaporated. The residual oil was dissolved in acetone to give a solution which was treated with a slight excess of ethereal hydrogen chloride. The solid which precipitated was collected by filtration and washed with acetone to give methyl 1-(2-chlorobenzyl)-1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (1.5 g.) m.p. 171°-175° C. The solution obtained evaporated were then added to the residue to give a mixture of pH 10 This mixture was extracted with ether (2×20 ml.) The combined extracts were washed with water dried (MgSO4) evaporated The residual oil was dissolved in acetone to give a solution which The solid which precipitated was collected by filtration washed with acetone

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

Procedure: A mixture of 5.0 g. (0.0282 mole) of 1,2,5,6-tetrahydro-3-pyridinecarboxylic acid methyl ester, hydrochloride, 8.08 g. (0.282 mole) of 4,4-diphenyl-3-butenyl bromide and 10 g. of crushed potassium carbonate was refluxed in 200 ml. of acetone for 15 hours. The reaction mixture was evaporated, extracted into ethyl acetate from water, dried, evaporated and chromatographed on silica (dry column) eluted with hexane/hexane:ethyl acetate to give 1,2,5,6-tetrahydro-1-(4,4-diphenyl-3-butenyl)-3-pyridinecarboxylic acid methyl ester hydrochloride. A mixture of 5.0 g The reaction mixture was evaporated extracted into ethyl acetate from water dried evaporated chromatographed on silica (dry column) eluted with hexane/hexane

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

Procedure: To 7.338 g (41.31 mol) of guvacoline hydrochloride (Arzneim. Forsch. 1989, 39(5), 539. ) in dioxane (100 ml) was added 5-chloro-dibenzosuberane (14.933 g, 65.39 mmol), Nal (catalytic, ˜1 g), and triethylamine (17 mL, 122.0 mmol) to give a brown heterogeneous slurry that was heated at 90° C. overnight. The solvent was then concentrated and the resultant sludge was taken up in ethyl acetate and sequentially washed with Na2HPO4 buffer (pH 4), Na2CO3 (saturated aqueous), and brine. The organics were then dried over Na2SO4 and concentrated, resulting in a brown solid which was purified by chromatography on silica gel eluting with 1-5% ethyl acetate/hexanes to give 1-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid methyl ester as a white solid (9.584 g, 28.74 mmol, 67%). 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 2.22 (dt, J=9.28, 2.68 Hz, 2H) 2.41 (t, J=5.56 Hz, 2H) 2.73-2.83 (m, 2H) 2.99-3.05 (m, 2H) 3.65 (s, 3 H) 3.90-4.00 (m, 2H) 4.11 (s, 1H) 6.94-6.99 (m, J=3.98, 3.98, 1.89, 1.77 Hz, 1 H) 7.05-7.11 (m, 4H) 7.13-7.21 (m, 4H). to give a brown heterogeneous slurry that The solvent was then concentrated sequentially washed with Na2HPO4 buffer (pH 4), Na2CO3 (saturated aqueous), and brine The organics were then dried over Na2SO4 concentrated resulting in a brown solid which was purified by chromatography on silica gel eluting with 1-5% ethyl acetate/hexanes

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

Procedure: A mixture of methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride (crude, 150 mmol), 5-chlorodibenzosuberane (41 g, 180 mmol, 1.2 eq), sodium iodide (2.2 g, 15 mmol, 0.1 eq) and triethylamine (63 mL, 450 mmol, 3.0 eq) in dioxane (300 mL) was stirred at 90° C. overnight. The reaction mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over MgSO4, and concentrated. The crude product was passed through a silica gel plug, eluting with CH2Cl2. After concentration, the resulting solid was triturated with ether to yield 27 g (55%) of methyl 1-(10,11-dihydro5H-dibenzo[a,d][7]annulen-5-yl)-1,2,5,6-tetrahydropyridine-3-carboxylate. The reaction mixture was concentrated in vacuo the residue was partitioned between ethyl acetate and water The organic phase was washed with brine dried over MgSO4 concentrated eluting with CH2Cl2 After concentration the resulting solid was triturated with ether

Conditions: temp:57.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Arecoline hydrobromide (25 g, 106 mmol) was neutralized with sodium carbonate (12.8 g, 120 mmol, 1.1 eq) in water (200 mL) for 30 min. The neutralized product was dissolved in toluene (50 mL) and added dropwise to a solution of triphosgene (16.3 g, 54.9 mmol, 0.52 eq) in toluene (100 mL) at 0° C. The resulting mixture was heated at 55-60° C. overnight. The reaction mixture was then concentrated in vacuo and the residue was dissolved in water (300 mL) and heated at 80° C. for 3 h. The water was evaporated and chased with toluene 3 times. The crude methyl 1,2,5,6-tetrahydropyridine-3-carboxylate hydrochloride, obtained as a thick brown oil, was used as is in the next reaction. The reaction mixture was then concentrated in vacuo the residue was dissolved in water (300 mL) heated at 80° C. for 3 h The water was evaporated