4-fluoro-2,3-dihydroinden-1-one

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a mixture of 3-(2-fluorophenyl)propionic acid (18.64 g, 0.111 mol) and dimethylformamide (5 drops) at room temperature was added dropwise oxalyl chloride (60 mL). The mixture was stirred at room temperature until gas evolution had ceased. The excess oxalyl chloride was removed by distillation to give 3-(2-fluorophenyl)propionyl chloride. A solution of the 3-(2-fluorophenyl)propionyl chloride in dichloromethane (230 mL) was added dropwise to a mixture of aluminum chloride (16.25 g, 0.12 mol) in dichloromethane (230 mL), and the mixture was refluxed for 3.5 h. The reaction mixture was poured into ice water (1200 mL), and the two phases were separated. The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1) to give 11.0 g of crude 4-fluoro-1-indanone as a yellow solid. Recrystallization from acetone: water mixtures gave 8.02 g (48%) of 4-fluoro-1-indanone as a pale yellow solid: m.p., 71°-72° C.; NM (DMSO-d6): d 7.51 (m, 3H, Ar), 3.13 (t, 2H, CH2), 2.74 (t, 2H, CH2). the mixture was refluxed for 3.5 h the two phases were separated The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL) dried over sodium sulfate filtered concentrated in vacuo The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1)

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

Procedure: In the same manner as in Example 1 and using 4-fluoro-1-indanone, 1-(4-fluoro-1-indan-1-ylpiperidin-4-yl)-1,3-dihydro-2H-benzimidazol-2-one was synthesized, which was then converted to hydrochloride with 4N hydrochloric acid-ethyl acetate solution to give the title compound as a brown solid. was synthesized

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

Procedure: A solution of 4-fluoro-2,3-dihydro-1H-inden-1-one (1.29 g, 9.34 mmol) and HNIB (5.02 g, 12.1 mmol) in CH3CN (190.0 mL) was refluxed for 1.5 h, until the solution was clear yellow. Upon cooling to r.t., NaN3 (1.21 g, 18.7 mmol) was added and the solution was stirred at r.t. for 12 h. Additional NaN3 (0.50 g, 7.7 mmol) was added and the solution stirred further at r.t. for 4 h. The reaction mixture was concentrated in vacuo, and the residue was taken up in CH2Cl2 (100 mL). This solution was washed with H2O (75 mL), dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified via column chromatography (SiO2, 5:1 hexanes/EtOAc) to give 1.61 g (96% yield) of 2-azido-4-fluoro-2,3-dihydro-1H-inden-1-one: 1H NMR (400 MHz, CDCl3): 7.59 (d, 1H), 7.41 (m, 1H), 7.32 (t, 1H), 4.15 (dd, 1H), 3.55 (dd, 1H), 2.89 (dd, 1H). the solution stirred further at r.t. for 4 h The reaction mixture was concentrated in vacuo This solution was washed with H2O (75 mL) dried (Na2SO4) filtered concentrated in vacuo The residue was purified via column chromatography (SiO2, 5:1 hexanes/EtOAc)

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

Procedure: To a 1000 mL round bottle flask were charged 4-fluoro-2,3-dihydro-1H-inden-1-one (249a) (5.04 g, 33.6 mmol), paraformaldehyde (10.08 g, 336 mmol), phenylboronic acid (4.92 g, 40.3 mmol) followed by toluene (235 mL), to the suspension was added TFA 2.6 mL, 33.6 mmol), and the resulting suspension was refluxed for 4 hrs, which resulted a clear yellowish solution. The solution was cooled to room temperature, and the pH was adjusted to 7-8 by adding saturated NaHCO3. After extracting with ethyl acetate, the organic layers were combined, and evaporated. The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane) to give 4-fluoro-2-methylene-2,3-dihydro-1H-inden-1-one (249b) (3.91 g, 72%). LC-MS tR=1.49 min in 3 min chromatography, MS (ESI) m/z 163 [M+H]+ was refluxed for 4 hrs which resulted a clear yellowish solution After extracting with ethyl acetate evaporated The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane)

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

Procedure: To a 1000 mL round bottle flask were charged 4-fluoro-2,3-dihydro-1H-inden-1-one (249a) (5.04 g, 33.6 mmol), paraformaldehyde (10.08 g, 336 mmol), phenylboronic acid (4.92 g, 40.3 mmol) followed by toluene (235 mL), to the suspension was added TFA 2.6 mL, 33.6 mmol), and the resulting suspension was refluxed for 4 hrs, which resulted a clear yellowish solution. The solution was cooled to room temperature, and the pH was adjusted to 7-8 by adding saturated NaHCO3. After extracting with ethyl acetate, the organic layers were combined, and evaporated. The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane) to give 4-fluoro-2-methylene-2,3-dihydro-1H-inden-1-one (249b) (3.91 g, 72%). LC-MS tR=1.49 min in 3 min chromatography, MS (ESI) m/z 163 [M+H]+ was refluxed for 4 hrs which resulted a clear yellowish solution After extracting with ethyl acetate evaporated The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane)

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

Procedure: To a mixture of 3-(2-fluorophenyl)propionic acid (18.64 g, 0.111 mol) and dimethylformamide (5 drops) at room temperature was added dropwise oxalyl chloride (60 mL). The mixture was stirred at room temperature until gas evolution had ceased. The excess oxalyl chloride was removed by distillation to give 3-(2-fluorophenyl)propionyl chloride. A solution of the 3-(2-fluorophenyl)propionyl chloride in dichloromethane (230 mL) was added dropwise to a mixture of aluminum chloride (16.25 g, 0.12 mol) in dichloromethane (230 mL), and the mixture was refluxed for 3.5 h. The reaction mixture was poured into ice water (1200 mL), and the two phases were separated. The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1) to give 11.0 g of crude 4-fluoro-1-indanone as a yellow solid. Recrystallization from acetone: water mixtures gave 8.02 g (48%) of 4-fluoro-1-indanone as a pale yellow solid: m.p., 71°-72° C.; NM (DMSO-d6): d 7.51 (m, 3H, Ar), 3.13 (t, 2H, CH2), 2.74 (t, 2H, CH2). the mixture was refluxed for 3.5 h the two phases were separated The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL) dried over sodium sulfate filtered concentrated in vacuo The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1)

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

Procedure: In the same manner as in Example 1 and using 4-fluoro-1-indanone, 1-(4-fluoro-1-indan-1-ylpiperidin-4-yl)-1,3-dihydro-2H-benzimidazol-2-one was synthesized, which was then converted to hydrochloride with 4N hydrochloric acid-ethyl acetate solution to give the title compound as a brown solid. was synthesized

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

Procedure: In the same manner as in Example 1 and using 4-fluoro-1-indanone, 1-(4-fluoro-1-indan-1-ylpiperidin-4-yl)-1,3-dihydro-2H-benzimidazol-2-one was synthesized, which was then converted to hydrochloride with 4N hydrochloric acid-ethyl acetate solution to give the title compound as a brown solid. was synthesized

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a mixture of 3-(2-fluorophenyl)propionic acid (18.64 g, 0.111 mol) and dimethylformamide (5 drops) at room temperature was added dropwise oxalyl chloride (60 mL). The mixture was stirred at room temperature until gas evolution had ceased. The excess oxalyl chloride was removed by distillation to give 3-(2-fluorophenyl)propionyl chloride. A solution of the 3-(2-fluorophenyl)propionyl chloride in dichloromethane (230 mL) was added dropwise to a mixture of aluminum chloride (16.25 g, 0.12 mol) in dichloromethane (230 mL), and the mixture was refluxed for 3.5 h. The reaction mixture was poured into ice water (1200 mL), and the two phases were separated. The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1) to give 11.0 g of crude 4-fluoro-1-indanone as a yellow solid. Recrystallization from acetone:water mixtures gave 8.02 g (48%) of 4-fluoro-1-indanone as a pale yellow solid: m.p., 71-72° C.; NMR (DMSO-d6): d 7.51 (m, 3H, Ar), 3.13 (t, 2H, CH2), 2.74 (t, 2H, CH2). the mixture was refluxed for 3.5 h the two phases were separated The dichloromethane phase was washed successively with 0.1N aqueous sodium hydroxide (2×100 mL), water (200 mL), and brine (200 mL) dried over sodium sulfate filtered concentrated in vacuo The residual oil was chromatographed on silica gel eluting with hexane:dichloromethane (9:1)

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

Procedure: To a 1000 mL round bottle flask were charged 4-fluoro-2,3-dihydro-1H-inden-1-one (249a) (5.04 g, 33.6 mmol), paraformaldehyde (10.08 g, 336 mmol), phenylboronic acid (4.92 g, 40.3 mmol) followed by toluene (235 mL), to the suspension was added TFA 2.6 mL, 33.6 mmol), and the resulting suspension was refluxed for 4 hrs, which resulted a clear yellowish solution. The solution was cooled to room temperature, and the pH was adjusted to 7-8 by adding saturated NaHCO3. After extracting with ethyl acetate, the organic layers were combined, and evaporated. The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane) to give 4-fluoro-2-methylene-2,3-dihydro-1H-inden-1-one (249b) (3.91 g, 72%). LC-MS tR=1.49 min in 3 min chromatography, MS (ESI) m/z 163 [M+H]+ was refluxed for 4 hrs which resulted a clear yellowish solution After extracting with ethyl acetate evaporated The residue was purified by flash chromatography (0 to 30% EtOAc/Hexane)