piperidin-4-one;hydrochloride

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

Procedure: To a mixture of piperidin-4-one HCl salt (4.08 g, 30 mmol) and Et3N (20 mL, 78.6 mmol) in EtOH (50 mL) was added 5-chloro-3-methyl-1,2,4-thiadiazole (4.05 g, 30 mmol). The mixture was heated to reflux for 1.5 hours and then concentrated to dryness. The residue was dissolved in EtOAc. The solution was washed with water (30 mL×3) and brine (30 mL), dried over Na2SO4, and concentrated to dryness. The residue was recrystalled from ether to give 1-(3-methyl-1,2,4-thiadiazol-5-yl)piperidin-4-one (510 mg, 8.6%). 1H-NMR (300 MHz, CDCl3) δ 3.86 (t, J=6.3 Hz, 4H), 2.62 (t, J=6.3, Hz, 4H), 2.44 (s, 3H). The mixture was heated to reflux for 1.5 hours concentrated to dryness The residue was dissolved in EtOAc The solution was washed with water (30 mL×3) and brine (30 mL) dried over Na2SO4 concentrated to dryness

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

Procedure: CDI (4.5 g) added to a solution of the benzo[1,2,3]thiadiazole-5-carboxylic acid (5 g) stirring in THF (100 ml) at RT. After 1 hour 4-piperidone hydrochloride (3.7 g) and triethylamine (4.3 ml) were added and the mixture stirred overnight. The resulting mixture was diluted with ethyl acetate, washed with 2M HCl (100 ml), saturated NaHCO3 solution (200 ml) and then with saturated brine (200 ml). The organic layer was dried (MgSO4) and evaporated to leave a residue which was purified by column chromatography (silica, eluting with mixtures of ethyl acetate in dichloromethane) to give the product as a yellow oil (2.1 g; MS: APCI+(M+H)262). washed with 2M HCl (100 ml), saturated NaHCO3 solution (200 ml) The organic layer was dried (MgSO4) evaporated to leave a residue which was purified by column chromatography (silica, eluting with mixtures of ethyl acetate in dichloromethane)

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

Procedure: PyBrOP™ (17.3 g) was added to a stirred mixture of 3-methanesulphonyl benzoic acid (7.35 g), 4-piperidone hydrochloride (5 g) and Hunig's base (25 ml) in dichloromethane (250 ml) with stirring at RT. The mixture was stirred overnight then washed with saturated NaHCO3 solution (200 ml) and then with saturated brine (200 ml). The organic layer was evaporated and the resulting residue purified by column chromatography (silica, 1:1 ethyl acetate:dichloromethane) to give the product as a thick oil (9.6 g; MS: APCI+(M+H) 282). The mixture was stirred overnight then washed with saturated NaHCO3 solution (200 ml) The organic layer was evaporated the resulting residue purified by column chromatography (silica, 1:1 ethyl acetate:dichloromethane)

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

Procedure: CDI (9 g) added to a solution of 3-methoxy-4-nitrobenzoic acid (10 g) stirring in THF (200 ml) at RT. After 1 hour, 4-piperidone hydrochloride (6.9 g) and triethylamine (7.8 ml) were added and the mixture stirred overnight. The mixture was diluted with ethyl acetate, washed with 2N HCl (100 ml) then saturated NaHCO3 solution (200 ml) then saturated brine (200 ml). The organic layer was dried (MgSO4) and evaporated to leave a residue which was purified by column chromatography (silica, mixtures of MeOH in dichloromethane) to give the product as a yellow solid (8.5 g; MS: APCI+(M+H) 279). washed with 2N HCl (100 ml) The organic layer was dried (MgSO4) evaporated to leave a residue which was purified by column chromatography (silica, mixtures of MeOH in dichloromethane)

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

Procedure: A mixture of 24.6 g of N-aminoiminodibenzyl (5-amino-10,11-dihydro-5H-dibenz[b,f]azepine) and 14.8 g of 4-piperidone hydrochloride in 250 ml. ethanol was heated on a steam bath for 15 minutes 1,2,3,4,4cooled; 8,9,14a-octahydropyridoof 20 g. indoloconcentrated sulfuric acid in 250 ml. ethanol was added. The resulting mixture was reheated on the steam bath for an additional 40 minutes; the solution which formed was cooled, basified with ammonia, and diluted with 1 liter of water. The crude, semisolid material which separated was taken up in ether, and the aqueous mother liquors were extracted with additional portions of ether. The combined ethereal extracts were concentrated to 500 ml. and treated, under an atmosphere of nitrogen and with vigorous stirring, with 50 ml. of 5N hydrochloric acid. The resulting precipitate was filtered off, washed with ether and C (dec). 1N hydrochloric acid, and dried in vacuo at 100° to yield 1,2,3,8,9-hexahydropyrido[4',3':2,3]=indolo[1,7ab][1]benzazepine hydrochloride, m.p. 309°, a salt only very slightly soluble in water. Dissolving the above salt in aqueous acetic acid, basifying with ammonia, filtering off the crude product and recrystallizing it from benzene regenerated the free 1,2,3,4,8,9-hexahydropyrido[4',3':2,3]indolo[1,7-ab][1]benzazepine, m.p. 134°-136° C. the solution which formed was cooled The crude, semisolid material which separated the aqueous mother liquors were extracted with additional portions of ether The combined ethereal extracts were concentrated to 500 ml and treated, under an atmosphere of nitrogen and with vigorous stirring, with 50 ml The resulting precipitate was filtered off washed with ether and C (dec) 1N hydrochloric acid, and dried in vacuo at 100°

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

Procedure: 4-Fluoronitrobenzene and piperidin-4-one hydrochloride were allowed to undergo the reaction in THF in the presence of potassium carbonate. The resulting compound was allowed to react with sodium hydride and ethyl diethylphosphonoacetate in THF. The resulting compound was subjected to catalytic hydrogenation in the same manner as shown in Reference Example 3 to obtain [1-(4-aminophenyl)piperidin-4-yl]acetic acid ethyl ester. NMR2: 1.27 (3H, t, J=7.2 Hz), 2.33 (2H, d, J=7.2 Hz), 6.66-6.89 (2H, m).

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

Procedure: 4-Fluoronitrobenzene and piperidin-4-one hydrochloride were allowed to undergo the reaction in THF in the presence of potassium carbonate. The resulting compound was allowed to react with sodium hydride and ethyl diethylphosphonoacetate in THF. The resulting compound was subjected to catalytic hydrogenation in the same manner as shown in Reference Example 3 to obtain [1-(4-aminophenyl)piperidin-4-yl]acetic acid ethyl ester. NMR2: 1.27 (3H, t, J=7.2 Hz), 2.33 (2H, d, J=7.2 Hz), 6.66-6.89 (2H, m).

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

Procedure: Prepared as described in general procedure (P) using 1,1-dicyclohexyl-3-(5-formyl-thiazol-2-yl)-urea (34 mg. 0.10 mmol), 4-piperidone hydrochloride (46 mg, 0.30 mmol) and sodium triacetoxyborohydride (25 mg, 0.12 mmol) to afford 5 mg (12%) of the desired product after purification. Prepared

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

Procedure: Prepared as described in general procedure (P) using 1,1-dicyclohexyl-3-(5-formyl-thiazol-2-yl)-urea (34 mg. 0.10 mmol), 4-piperidone hydrochloride (46 mg, 0.30 mmol) and sodium triacetoxyborohydride (25 mg, 0.12 mmol) to afford 5 mg (12%) of the desired product after purification. Prepared

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

Procedure: Methyl 3-(bromomethyl)-6-(methylsulfonyl)-2-[3-(trifluoromethyl)phenyl]-4-quinolinecarboxylate (2 g, 3.98 mmol), 4-piperidone HCl salt (0.648 g, 4.78 mmol), N,N-diisopropylethylamine (1.53 mL, 8.76 mmol) in acetonitrile (13.27 mL) was heated to 50° C. overnight. The solvent was removed under reduced pressure. The residue was diluted with Na2CO3 and extracted with methylene chloride (four times). The combined organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified via column chromatography (ISCO, 40 g silica, 5-100% ethyl acetate/hexanes) to afford methyl 6-(methylsulfonyl)-3-[(4-oxo-1-piperidinyl)methyl]-2-[3-(trifluoromethyl)phenyl]-4-quinolinecarboxylate (1.051 g, 51% yield). MS (m/z) 521.0 (M+H+). The solvent was removed under reduced pressure The residue was diluted with Na2CO3 extracted with methylene chloride (four times) The combined organic extracts were washed with brine dried over Na2SO4 filtered concentrated in vacuo The residue was purified via column chromatography (ISCO, 40 g silica, 5-100% ethyl acetate/hexanes)

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

Procedure: Methyl 3-(bromomethyl)-6-(methylsulfonyl)-2-[3-(trifluoromethyl)phenyl]-4-quinolinecarboxylate (2 g, 3.98 mmol), 4-piperidone HCl salt (0.648 g, 4.78 mmol), N,N-diisopropylethylamine (1.53 mL, 8.76 mmol) in acetonitrile (13.27 mL) was heated to 50° C. overnight. The solvent was removed under reduced pressure. The residue was diluted with Na2CO3 and extracted with methylene chloride (four times). The combined organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified via column chromatography (ISCO, 40 g silica, 5-100% ethyl acetate/hexanes) to afford methyl 6-(methylsulfonyl)-3-[(4-oxo-1-piperidinyl)methyl]-2-[3-(trifluoromethyl)phenyl]-4-quinolinecarboxylate (1.051 g, 51% yield). MS (m/z) 521.0 (M+H+). The solvent was removed under reduced pressure The residue was diluted with Na2CO3 extracted with methylene chloride (four times) The combined organic extracts were washed with brine dried over Na2SO4 filtered concentrated in vacuo The residue was purified via column chromatography (ISCO, 40 g silica, 5-100% ethyl acetate/hexanes)

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

Procedure: A suspension of 5-methyl-2-(pyridin-4-yl)benzoic acid hydrochloride (2.0 g), piperidin-4-one hydrochloride (1.2 g), DMTMM (3.3 g) and N-methylmorpholine (2.6 mL) in DMF (30 mL) was stirred at room temperature for 5 hr, and then overnight at 100° C. The reaction mixture was diluted with water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (0.73 g). overnight at 100° C the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried over anhydrous sodium sulfate The solvent was evaporated under reduced pressure The residue was purified by silica gel column chromatography (ethyl acetate/hexane)