3-(1-acetylpiperidin-4-yl)propanoyl chloride

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

Procedure: To a mixture of 3,4-dihydro-2H-1-benzothiopyran (1.5 g) and 3-(1-acetylpiperidin-4-yl)propionyl chloride (2.18 g) in 1,2-dichloroethane (20ml) was added aluminum chloride (3.2 g) portionwise at 10°-15° C. The mixture was stirred at room temperature for 2 hours then refluxed for additional 2 hours, and poured into icewater. The mixture was extracted with dichloromethane, washed with water, dried over anhydrous sodium sulfate. The solvent was distilled off. The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate) to obtain 2.7 g of the title compound as a pale yellow oil. then refluxed for additional 2 hours poured into icewater The mixture was extracted with dichloromethane washed with water dried over anhydrous sodium sulfate The solvent was distilled off The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate)

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

Procedure: To 200 ml of 1,2-dichloroethane were added 9.65 g (44 mmol) of 3-(1-acetylpiperidin-4-yl)propionic acid chloride and 10.65 g (89 mmol), of 2,3-dihydrobenzofuran. To the mixture was added 12.82 g (96 mmol) of aluminum chloride in limited amounts, then the mixture was stirred for 3 hours at room temperature. The reaction mixture was poured into ice-water, which was subjected to extraction with methylene chloride. Organic layers were combined and washed with water and dried over anhydrous sodium sulfate, followed by distilling off the solvent. The residue was purified by means of a silica gel column chromatography (ethyl acetate) to give 10.47 g (78%) of 5-[3-(1-acetylpiperidin-4-yl)-1-oxopropyl]-2,3-dihydrobenzofuran. Recrystallization from methylene chloride--diethyl ether gave colorless needles, m.p. 93°-95° C. was subjected to extraction with methylene chloride washed with water dried over anhydrous sodium sulfate by distilling off the solvent The residue was purified by means of a silica gel column chromatography (ethyl acetate)

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

Procedure: To 100 ml of thionyl chloride was added 26 g of 3-(1-acetylpiperidin-4-yl)propionic acid, obtained in Reference Example 1-(2), in small portions with ice-cooling. The mixture was stirred for 5 minutes, after which the excess thionyl chloride was distilled off and the solid residue was washed with diethyl ether to give 26.4 g of 3-(1-acetylpiperidin-4-yl)propionyl chloride as a pale yellow powder. in small portions with ice-cooling after which the excess thionyl chloride was distilled off the solid residue was washed with diethyl ether

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 90 ml solution of 5.0 g of carbazole and 7.2 g of 3-(1-acetylpiperidin-4-yl)propionyl chloride in nitromethane, 9.3 g of aluminum chloride was added little by little, followed by stirring at 70° C. for 11 hours. The reaction mixture was poured over 100 ml of ice water, and the organic layer was separated and then washed by sequential additions of a 50 ml saturated aqueous sodium hydrogen carbonate solution and 50 ml of distilled water. After the mixture was dried over anhydrous sodium sulfate, the solvent was distilled off to yield an oily residue. The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate-methanol=20:1 (v/v)) to yield 2.6 g of the title compound as a light yellow powder. the organic layer was separated washed by sequential additions of a 50 ml saturated aqueous sodium hydrogen carbonate solution and 50 ml of distilled water After the mixture was dried over anhydrous sodium sulfate the solvent was distilled off to yield an oily residue The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate-methanol=20:1 (v/v))

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 90 ml solution of 5.0 g of carbazole and 7.2 g of 3-(1-acetylpiperidin-4-yl)propionyl chloride in nitromethane, 9.3 g of aluminum chloride was added little by little, followed by stirring at 70° C. for 11 hours. The reaction mixture was poured over 100 ml of ice water, and the organic layer was separated and then washed by sequential additions of a 50 ml saturated aqueous sodium hydrogen carbonate solution and 50 ml of distilled water. After the mixture was dried over anhydrous sodium sulfate, the solvent was distilled off to yield an oily residue. The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate-methanol=20:1 (v/v)) to yield 2.6 g of the title compound as a light yellow powder. the organic layer was separated washed by sequential additions of a 50 ml saturated aqueous sodium hydrogen carbonate solution and 50 ml of distilled water After the mixture was dried over anhydrous sodium sulfate the solvent was distilled off to yield an oily residue The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate-methanol=20:1 (v/v))

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

Procedure: Into thionyl chloride (300 ml) was added 3-(1-acetyl-4-piperidinyl)propionic acid (88.2 g, 0.443 mol) in small portions under ice cooling. After the resulting mixture was stirred at room temperature for 10 minutes, the thionyl chloride was evaporated under reduced pressure at 25° C. The resulting residue was mixed with diethyl ether and was evaporated under reduced pressure to leave a yellow solid residue. An additional diethyl ether was added to the residue and the solid substance was subjected to pulverization by the use of a spatula, followed by evaporation under reduced pressure to obtain a crude product of 3-(1-acetyl-4-piperidinyl)propionyl chloride as a yellow powder. To a suspension of this yellow powder and 1,2,5,6-tetrahydro-4H-pyrrolo[3,2,1-ij]quinoline-4-one (64.0 g, 0.369 mol) in 1,2-dichloroethane (200 ml) was added aluminum chloride (162 g, 1.21 mol) in small portions at room temperature. After stirring at room temperature for 12 hours, the reaction mixture was poured into ice water and extracted with ethyl acetate. The extract was washed with a saturated aqueous solution of sodium chloride, dried with anhydrous magnesium sulfate, and then evaporated under reduced pressure to remove the solvents, thereby obtaining an oily pale yellow substance. This oily substance was purified by column chromatography on silica gel (eluent: ethyl acetate-methanol=9:1) and crystallization from ethanol and diethyl ether to obtain 123 g of 8-[3-(1-acetyl-4-piperidinyl)-1-oxopropyl]-1,2,5,6-tetrahydro-4H-pyrrolo-[3,2,1-ij]quinolin-4-one, as colorless crystals having the melting point of 157-159° C. the thionyl chloride was evaporated under reduced pressure at 25° C The resulting residue was mixed with diethyl ether was evaporated under reduced pressure to leave a yellow solid residue followed by evaporation under reduced pressure

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

Procedure: To thionyl chloride (300 mL) was added 3-(1-acetyl-4-piperidinyl)propionic acid (88.2 g, 0.443 mol) in small portions under ice cooling. The mixture was stirred at room temperature for 10 minutes, and then thionyl chloride was distilled off at 25° C. under reduced pressure. Diethyl ether was added to the residue and then evaporated in vacuo to give a yellow solid. Again, diethyl ether was added, and the solid was crushed with a spatula, and ether was evaporated in vacuo to give 3-(1-acetyl-4-piperidinyl)propionic acid chloride as crude light yellow powder. This light yellow powder and 1,2,5,6-tetrahydro-4H-pyrrolo[3,2,1-ij]quinolin-4-one (64.0 g, 0.369 mol) were suspended into 1,2-dichloroethane (200 mL), into which aluminum chloride (162 g, 1.21 mol) was added in small portions at room temperature. The mixture was stirred at room temperature for 12 hours, then added to ice-water, and extracted with ethyl acetate. The extract was washed with saturated brine, dried on anhydrous magnesium sulfate, and evaporated in vacuo to give a light yellow oily material. The oily material was purified by silica gel column chromatography (eluted with ethyl acetate/methanol=9:1) and crystallized from ethanol-diethyl ether to give 123.5 g of 8-[3-[(1-acetyl-4-piperidinyl)-1-oxopropyl]-1,2,5,6-tetrahydro-4H-pyrrolo[3,2,1-ij]quinolin-4-one as colorless crystals having mp. 157-159° C. thionyl chloride was distilled off at 25° C. under reduced pressure Diethyl ether was added to the residue evaporated in vacuo to give a yellow solid was evaporated in vacuo

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

Procedure: 3-(1-Acetyl-4-piperidinyl)propionic acid (10.0 g) was added by portions to thionyl chloride (30 ml) at room temperature. After stirring at room temperature for 30 minutes, thionyl chloride was evaporated under reduced pressure to give the crude product of 3-(1-acetyl-4-piperidinyl)propionyl chloride. Aluminum chloride (20 g) was added by portions to a suspension of the crude product and 2,2,2-trifluoro-N-(2-methoxyphenyl)acetamide (10.0 g) at room temperature. After stirring at room temperature for 1 hour, the reaction mixture was poured into ice (200 g), extracted with ethyl acetate, and washed with brine. The organic layer was dried over anhydrous magnesium sulfate, the solvent was evaporated under reduced pressure, the resulting residue was purified by silica gel chromatography (eluting solvent; ethyl acetate), and the solvent was evaporated to give the title compound as colorless crystals (8.83 g) having a melting point of 77 to 79° C. thionyl chloride was evaporated under reduced pressure

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

Procedure: To a mixture of 3,4-dihydro-2H-1-benzothiopyran (1.5 g) and 3-(1-acetylpiperidin-4-yl)propionyl chloride (2.18 g) in 1,2-dichloroethane (20ml) was added aluminum chloride (3.2 g) portionwise at 10°-15° C. The mixture was stirred at room temperature for 2 hours then refluxed for additional 2 hours, and poured into icewater. The mixture was extracted with dichloromethane, washed with water, dried over anhydrous sodium sulfate. The solvent was distilled off. The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate) to obtain 2.7 g of the title compound as a pale yellow oil. then refluxed for additional 2 hours poured into icewater The mixture was extracted with dichloromethane washed with water dried over anhydrous sodium sulfate The solvent was distilled off The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate)

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

Procedure: To a mixture of 3,4-dihydro-2H-1-benzothiopyran (1.5 g) and 3-(1-acetylpiperidin-4-yl)propionyl chloride (2.18 g) in 1,2-dichloroethane (20ml) was added aluminum chloride (3.2 g) portionwise at 10°-15° C. The mixture was stirred at room temperature for 2 hours then refluxed for additional 2 hours, and poured into icewater. The mixture was extracted with dichloromethane, washed with water, dried over anhydrous sodium sulfate. The solvent was distilled off. The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate) to obtain 2.7 g of the title compound as a pale yellow oil. then refluxed for additional 2 hours poured into icewater The mixture was extracted with dichloromethane washed with water dried over anhydrous sodium sulfate The solvent was distilled off The residue was purified by silica gel column chromatography (developing solvent: ethyl acetate)

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

Procedure: To 200 ml of 1,2-dichloroethane were added 9.65 g (44 mmol) of 3-(1-acetylpiperidin-4-yl)propionic acid chloride and 10.65 g (89 mmol), of 2,3-dihydrobenzofuran. To the mixture was added 12.82 g (96 mmol) of aluminum chloride in limited amounts, then the mixture was stirred for 3 hours at room temperature. The reaction mixture was poured into ice-water, which was subjected to extraction with methylene chloride. Organic layers were combined and washed with water and dried over anhydrous sodium sulfate, followed by distilling off the solvent. The residue was purified by means of a silica gel column chromatography (ethyl acetate) to give 10.47 g (78%) of 5-[3-(1-acetylpiperidin-4-yl)-1-oxopropyl]-2,3-dihydrobenzofuran. Recrystallization from methylene chloride--diethyl ether gave colorless needles, m.p. 93°-95° C. was subjected to extraction with methylene chloride washed with water dried over anhydrous sodium sulfate by distilling off the solvent The residue was purified by means of a silica gel column chromatography (ethyl acetate)

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

Procedure: To 200 ml of 1,2-dichloroethane were added 9.65 g (44 mmol) of 3-(1-acetylpiperidin-4-yl)propionic acid chloride and 10.65 g (89 mmol), of 2,3-dihydrobenzofuran. To the mixture was added 12.82 g (96 mmol) of aluminum chloride in limited amounts, then the mixture was stirred for 3 hours at room temperature. The reaction mixture was poured into ice-water, which was subjected to extraction with methylene chloride. Organic layers were combined and washed with water and dried over anhydrous sodium sulfate, followed by distilling off the solvent. The residue was purified by means of a silica gel column chromatography (ethyl acetate) to give 10.47 g (78%) of 5-[3-(1-acetylpiperidin-4-yl)-1-oxopropyl]-2,3-dihydrobenzofuran. Recrystallization from methylene chloride--diethyl ether gave colorless needles, m.p. 93°-95° C. was subjected to extraction with methylene chloride washed with water dried over anhydrous sodium sulfate by distilling off the solvent The residue was purified by means of a silica gel column chromatography (ethyl acetate)