N-(2-fluoroethyl)aniline

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 3-bromo-2-hydroxy-5-methyl-cyclohex-1-enecarboxylic acid diethylamide (47; prepared according to Example 11(d)) (2.0 g, 7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (1.9 g, 14 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (7 mL) and dry zinc chloride (2.86 g, 21 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL) and washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried and concentrated in vacuo. The crude mixture was purified by SCX cartridge (40 mL) and then silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min) to afford 400 mg (17%) of 9-(2-fluoro-ethyl)-2-methyl-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid diethylamide (non-radioactive imaging agent 11) as a white solid. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 1.10-1.35 (9H, m, CH3 and N(CH2CH3)2), 1.95-2.10 (2H, m, 3-CH2), 2.30-2.50 (1H, m, 2-CH), 2.70-2.80 (2H, m, 1-CH2), 3.40-3.70 (4H, m, N(CH2CH3)2), 4.05-4.15 (1H, m, 4-CH), 4.30 (2H, dm, J=21 Hz, NCH2CH2F), 4.65 (2H, dm, J=41 Hz, NCH2CH2F), and 7.00-7.30 (4H, m, NCCHCHCHCH. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (100 mL) washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried concentrated in vacuo The crude mixture was purified by SCX cartridge (40 mL) silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (560 mg, 4.0 mmol) and 3-bromo-2-hydroxy-cyclohex-1-enecarboxylic acid ethyl ester (29) (500 mg, 2.0 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (4 mL) and dry zinc chloride (820 mg, 6 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The product was dissolved in ethyl acetate/ether (30 mL/150 mL) and washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried and concentrated to afford 447 mg (91%) of 9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid ethyl ester (30) as a yellow oil which was used in the next step without purification. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 14.3, 20.4, 21.7, 26.4, 38.5, 43.1 (d, JCF=15 Hz), 60.6, 76.6, 77.0, 77.4, 82.1 (d, JCF=173 Hz), 106.9, 108.5, 118.9, 119.4, 121.1, 127.1, 136.2, 136.7, 174.9. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The product was dissolved in ethyl acetate/ether (30 mL/150 mL) washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried concentrated

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-bromo-6-(piperidine-1-carbonyl)-cyclohexanone (20; prepared according to example 3(b)) (500 mg, 1.7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24) (890 mg, 3.5 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (2 mL) and dry zinc chloride (682 mg, 5 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (50 mL) and washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried and concentrated in vacuo. The crude material was triturated with diethyl ether to afford 151 mg (27%) of [9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazol-4-yl]-piperidin-1-yl-methanone (non-radioactive imaging agent 6) as a white solid. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 21.6, 21.8, 24.7, 26.5, 26.9, 27.4, 37.3, 43.1 (d, JCF=45 Hz), 47.0, 82.1 (d, JCF=173 Hz), 108.5, 108.9, 118.6, 119.4, 121.0, 126.8, 136.2, 172.7. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (50 mL) washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried concentrated in vacuo The crude material was triturated with diethyl ether

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a round bottom flask aniline (0.5 g, 5.4 mmol), 2,6-lutidine (0.58 g, 5.4 mmol) and 2-fluoroethyl tosylate (12; prepared according to Example 2(a)) (1.17 g, 5.4 mmol) were combined in DMF (2.5 mL) and stirred at 100° C. overnight. The reaction was allowed to cool and then diluted with ethyl acetate (50 mL). This was washed with water (3×20 mL) and the organics were dried and concentrated in vacuo. The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min) to give 435 mg (60%) of (2-fluoro-ethyl)-phenyl-amine (24) as a yellow oil. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 3.41 (1H, t, J=3 Hz, NCH2CH2F), 3.50 (1H, t, J=3 Hz, NCH2CH2F), 3.93 (1H, s, br), 4.54 (1H, t, J=3 Hz, NCH2CH2F), 4.71 (1H, t, J=3 Hz, NCH2CH2F), 6.65-6.82 (3H, m, 2×NCCH, NCCHCHCH), 7.14-7.28 (2H, m, 2×NCCHCHCH). to cool This was washed with water (3×20 mL) the organics were dried concentrated in vacuo The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min)

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a round bottom flask aniline (0.5 g, 5.4 mmol), 2,6-lutidine (0.58 g, 5.4 mmol) and 2-fluoroethyl tosylate (12; prepared according to Example 2(a)) (1.17 g, 5.4 mmol) were combined in DMF (2.5 mL) and stirred at 100° C. overnight. The reaction was allowed to cool and then diluted with ethyl acetate (50 mL). This was washed with water (3×20 mL) and the organics were dried and concentrated in vacuo. The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min) to give 435 mg (60%) of (2-fluoro-ethyl)-phenyl-amine (24) as a yellow oil. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 3.41 (1H, t, J=3 Hz, NCH2CH2F), 3.50 (1H, t, J=3 Hz, NCH2CH2F), 3.93 (1H, s, br), 4.54 (1H, t, J=3 Hz, NCH2CH2F), 4.71 (1H, t, J=3 Hz, NCH2CH2F), 6.65-6.82 (3H, m, 2×NCCH, NCCHCHCH), 7.14-7.28 (2H, m, 2×NCCHCHCH). to cool This was washed with water (3×20 mL) the organics were dried concentrated in vacuo The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 3-bromo-2-hydroxy-5-methyl-cyclohex-1-enecarboxylic acid diethylamide (47; prepared according to Example 11(d)) (2.0 g, 7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (1.9 g, 14 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (7 mL) and dry zinc chloride (2.86 g, 21 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL) and washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried and concentrated in vacuo. The crude mixture was purified by SCX cartridge (40 mL) and then silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min) to afford 400 mg (17%) of 9-(2-fluoro-ethyl)-2-methyl-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid diethylamide (non-radioactive imaging agent as a white solid. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 1.10-1.35 (9H, m, CH3 and N(CH2CH3)2), 1.95-2.10 (2H, m, 3-CH2), 2.30-2.50 (1H, m, 2-CH), 2.70-2.80 (2H, m, 1-CH2), 3.40-3.70 (4H, m, N(CH2CH3)2), 4.05-4.15 (1H, m, 4-CH), 4.30 (2H, dm, J=21 Hz, NCH2CH2F), 4.65 (2H, dm, J=41 Hz, NCH2CH2F), and 7.00-7.30 (4H, m, NCCHCHCHCH. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (100 mL) washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried concentrated in vacuo The crude mixture was purified by SCX cartridge (40 mL) silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (560 mg, 4.0 mmol) and 3-bromo-2-hydroxy-cyclohex-1-enecarboxylic acid ethyl ester (29) (500 mg, 2.0 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (4 mL) and dry zinc chloride (820 mg, 6 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The product was dissolved in ethyl acetate/ether (30 mL/150 mL) and washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried and concentrated to afford 447 mg (91%) of 9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid ethyl ester (30) as a yellow oil which was used in the next step without purification. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 14.3, 20.4, 21.7, 26.4, 38.5, 43.1 (d, JCF=15 Hz), 60.6, 76.6, 77.0, 77.4, 82.1 (d, JCF=173 Hz), 106.9, 108.5, 118.9, 119.4, 121.1, 127.1, 136.2, 136.7, 174.9. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The product was dissolved in ethyl acetate/ether (30 mL/150 mL) washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried concentrated

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-bromo-6-(piperidine-1-carbonyl)-cyclohexanone (20; prepared according to example 3(b)) (500 mg, 1.7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24) (890 mg, 3.5 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (2 mL) and dry zinc chloride (682 mg, 5 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (50 mL) and washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried and concentrated in vacuo. The crude material was triturated with diethyl ether to afford 151 mg (27%) of [9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazol-4-yl]-piperidin-1-yl-methanone (non-radioactive imaging agent 6) as a white solid. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC21.6, 21.8, 24.7, 26.5, 26.9, 27.4, 37.3, 43.1 (d, JCF=45 Hz), 47.0, 82.1 (d, JCF=173 Hz), 108.5, 108.9, 118.6, 119.4, 121.0, 126.8, 136.2, 172.7. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (50 mL) washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried concentrated in vacuo The crude material was triturated with diethyl ether

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a round bottom flask aniline (0.5 g, 5.4 mmol), 2,6-lutidine (0.58 g, 5.4 mmol) and 2-fluoroethyl tosylate (12; prepared according to Example 2(a)) (1.17 g, 5.4 mmol) were combined in DMF (2.5 mL) and stirred at 100° C. overnight. The reaction was allowed to cool and then diluted with ethyl acetate (50 mL). This was washed with water (3×20 mL) and the organics were dried and concentrated in vacuo. The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min) to give 435 mg (60%) of (2-fluoro-ethyl)-phenyl-amine (24) as a yellow oil. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 3.41 (1H, t, J=3 Hz, NCH2CH2F), 3.50 (1H, t, J=3 Hz, NCH2CH2F), 3.93 (1H, s, br), 4.54 (1H, t, J=3 Hz, NCH2CH2F), 4.71 (1H, t, J=3 Hz, NCH2CH2F), 6.65-6.82 (3H, m, 2×NCCH, NCCHCHCH), 7.14-7.28 (2H, m, 2×NCCHCHCH). to cool This was washed with water (3×20 mL) the organics were dried concentrated in vacuo The crude material was purified by silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (100 g, 0-100% B, 18 CV, 85 mL/min)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 3-bromo-2-hydroxy-5-methyl-cyclohex-1-enecarboxylic acid diethylamide (47; prepared according to Example 11(d)) (2.0 g, 7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (1.9 g, 14 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (7 mL) and dry zinc chloride (2.86 g, 21 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL) and washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried and concentrated in vacuo. The crude mixture was purified by SCX cartridge (40 mL) and then silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min) to afford 400 mg (17%) of 9-(2-fluoro-ethyl)-2-methyl-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid diethylamide (non-radioactive imaging agent 11) as a white solid. The structure was confirmed by 1H NMR (300 MHz, CDCl3) δH 1.10-1.35 (9H, m, CH3 and N(CH2CH3)2), 1.95-2.10 (2H, m, 3-CH2), 2.30-2.50 (1H, m, 2-CH), 2.70-2.80 (2H, m, 1-CH2), 3.40-3.70 (4H, m, N(CH2CH3)2), 4.05-4.15 (1H, m, 4-CH), 4.30 (2H, dm, J=21 Hz, NCH2CH2F), 4.65 (2H, dm, J=41 Hz, NCH2CH2F), and 7.00-7.30 (4H, m, NCCHCHCHCH. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (100 mL) washed with 2 N HCl (30 mL), water (2×30 mL) and aqueous potassium carbonate solution (2×30 mL) then dried concentrated in vacuo The crude mixture was purified by SCX cartridge (40 mL) silica gel chromatography eluting with petrol (A) and ethyl acetate (B) (0-100% B, 100 g, 12 CV, 85 mL/min)

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of (2-fluoro-ethyl)-phenyl-amine (24; prepared according to Example 4(a)) (560 mg, 4.0 mmol) and 3-bromo-2-hydroxy-cyclohex-1-enecarboxylic acid ethyl ester (29) (500 mg, 2.0 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (4 mL) and dry zinc chloride (820 mg, 6 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The product was dissolved in ethyl acetate/ether (30 mL/150 mL) and washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried and concentrated to afford 447 mg (91%) of 9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazole-4-carboxylic acid ethyl ester (30) as a yellow oil which was used in the next step without purification. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 14.3, 20.4, 21.7, 26.4, 38.5, 43.1 (d, JCF=15 Hz), 60.6, 76.6, 77.0, 77.4, 82.1 (d, JCF=173 Hz), 106.9, 108.5, 118.9, 119.4, 1211, 127.1, 136.2, 136.7, 174.9. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The product was dissolved in ethyl acetate/ether (30 mL/150 mL) washed with 2 N HCl (40 mL), water (2×100 mL) and aqueous potassium carbonate solution (2×100 mL) then dried concentrated

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-bromo-6-(piperidine-1-carbonyl)-cyclohexanone (20; prepared according to example 3(b)) (500 mg, 1.7 mmol) and (2-fluoro-ethyl)-phenyl-amine (24) (890 mg, 3.5 mmol) was stirred under N2 at 50° C. for 3 h and the reaction turned brown. The resulting mixture was dissolved in propan-2-ol (2 mL) and dry zinc chloride (682 mg, 5 mmol) was added. The mixture was heated to reflux under N2 for 16 h and then concentrated in vacuo. The residue was dissolved in ethyl acetate (50 mL) and washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried and concentrated in vacuo. The crude material was triturated with diethyl ether to afford 151 mg (27%) of [9-(2-fluoro-ethyl)-2,3,4,9-tetrahydro-1H-carbazol-4-yl]-piperidin-1-yl-methanone (non-radioactive imaging agent 6) as a white solid. The structure was confirmed by 13C NMR (75 MHz, CDCl3) δC 21.6, 21.8, 24.7, 26.5, 26.9, 27.4, 37.3, 43.1 (d, JCF=45 Hz), 47.0, 82.1 (d, JCF=173 Hz), 108.5, 108.9, 118.6, 119.4, 121.0, 126.8, 136.2, 172.7. The mixture was heated to reflux under N2 for 16 h concentrated in vacuo The residue was dissolved in ethyl acetate (50 mL) washed with 2 N HCl (20 mL), water (2×20 mL) and aqueous potassium carbonate solution (2×20 mL) then dried concentrated in vacuo The crude material was triturated with diethyl ether