(4-bromo-2-fluorophenyl)boronic acid

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

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

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Bromo-2-fluorobenzeneboronic acid (0.69 g, 3.10 mmol) was added to a solution of 1,1-dimethylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (1.0 g, 2.70 mmol) in DME (30 mL), followed by addition of 2M Na2CO3 (8 mL) and Pd(PPh3)4 (0.16 g, 0.13 mmol). The reaction mixture was degassed with N2 and heated at 80° C. for 4 h, then cooled to ambient temperature. Water was added and the mixture was extracted with EtOAc (70 mL×2). The combined organic extract was washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product. The crude product was purified by chromatography on a silica gel column eluted with 1:5 EtOAc/hexanes to give 0.785 g (63%) of 1,1-dimethylethyl 4-({[6-(4-bromo-2-fluorophenyl)-3-pyridinyl]oxy}methyl)-1-piperidinecarboxylate as an off-white solid. 1H NMR (400 MHz, CDCl3): δ 8.38 (d, 1H, J=2.6 Hz), 7.90-7.85 (m, 1H), 7.75-7.65 (m, 1H), 7.40-7.30 (m, 2H), 7.30-7.20 (m, 1H), 4.18 (bs, 2H), 3.89 (d, 2H, J=6.3 Hz), 2.85-2.70 (m, 2H), 2.05-1.95 (m, 1H), 1.90-1.80 (m, 2H), 1.46 (s, 9H), 1.35-1.25 (m, 2H); LRMS m/z 465/467 (M+H). The reaction mixture was degassed with N2 cooled to ambient temperature Water was added the mixture was extracted with EtOAc (70 mL×2) The combined organic extract was washed with brine dried over Na2SO4 filtered the filtrate was concentrated to give the crude product The crude product was purified by chromatography on a silica gel column eluted with 1:5 EtOAc/hexanes

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

Procedure: A mixture of Pd(PPh3)2Cl2 (0.42 g, 0.57 mmol) and 2-bromo-5-hydroxypyridine (1.0 g, 5.75 mmol) in DME (20 mL) was degassed with N2. 2M Na2CO3 (10 mL) was added, and the mixture was stirred at ambient temperature for 10 minutes. 4-Bromo-2-fluorobenzeneboronic acid (1.48 g, 6.61 mmol) was added. The reaction mixture was degassed again, purged with N2 and heated at 80° C. overnight, then cooled to ambient temperature, and partitioned between water and EtOAc. Concentrated HCl was added carefully to adjust aqueous pH to about 8, the mixture was filtered thought Celite®, and the EtOAc layer was separated and washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product as a dark brown oil. The crude product was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexane to give 0.168 g of 6-(4-bromo-2-fluorophenyl)-3-pyridinol as an off-white solid. The impure fractions were combined, concentrated and further purified with 1:5 acetone/hexane to give additional 78 mg of 6-(4-bromo-2-fluorophenyl)-3-pyridinol (0.246 g overall, 16% yield). 1H NMR (400 MHz, CD3OD): δ 8.20 (d, 1H, J=2.7 Hz), 7.75-7.65 (m, 1H), 7.62 (dd, 1H, Ja=8.7 Hz, Jb=2.1 Hz), 7.50-7.40 (m, 2H), 7.28 (dd, 1H, Ja=8.5 Hz, Jb=2.9 Hz); LRMS (ESI), m/z 268/270 (M+H). was degassed with N2 2M Na2CO3 (10 mL) was added The reaction mixture was degassed again purged with N2 heated at 80° C. overnight cooled to ambient temperature partitioned between water and EtOAc Concentrated HCl was added carefully the mixture was filtered the EtOAc layer was separated washed with brine dried over Na2SO4 filtered the filtrate was concentrated to give the crude product as a dark brown oil The crude product was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexane

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

Procedure: 1,1-Dimethylethyl 4-({[6-(4-bromo-2-fluorophenyl)-3-pyridinyl]oxy}methyl)-1-piperidinecarboxylate (0.23 g, ˜90% purity, 42%) was prepared as a white solid from (4-bromo-2-fluorophenyl)boronic acid (0.30 g, 1.36 mmol), 1,1-dimethylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (0.44 g, 1.19 mmol), 2M Na2CO3 (2 mL), and PdCl2(PPh3)2 (85 mg, 0.12 mmol) in DME (4 mL) in a manner similar to Example 21, Step 3. The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes. 1H NMR (400 MHz, CDCl3): δ 8.38 (d, 1H, J=2.7 Hz), 7.90-7.85 (m, 1H), 7.72 (d, 1H, J=8.8 Hz), 7.45-7.30 (m, 2H), 7.30-7.25 (m, 1H), 4.25-4.10 (m, 2H), 3.99 (d, 2H, J=6.4 Hz), 2.95-2.80 (m, 2H), 2.05-1.95 (m, 1H), 1.90-1.80 (m, 2H), 1.46 (s, 9H), 1.35-1.25 (m, 2H); LRMS (ESI), m/z 465/467 (M+H). The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes

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

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

Procedure: 4-Bromo-2-fluorophenyl boronic acid (2AB) (3.0 g, 13.71 mmol, 1 equiv), 2-bromopyrimidine (1AB) (6.54 g, 41.13 mmol, 3 equiv), and 2M sodium carbonate (34 mL) were added in a pressure vessel (350 mL) and a (1v:1v) mixture of toluene and ethanol (45 mL: 45 mL) was added. The mixture was then bubbled with nitrogen gas for about 10 minutes. Tetrakistriphenylphosphine palladium (0) (793 mg, 0.686 mmol, 0.05 equiv) was added to the mixture. The reaction vessel was tightly capped, placed in an oil bath at 90° C. and stirred overnight. was added The mixture was then bubbled with nitrogen gas for about 10 minutes The reaction vessel was tightly capped placed in an oil bath at 90° C.

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Bromo-2-fluorobenzeneboronic acid (0.69 g, 3.10 mmol) was added to a solution of 1,1-dimethylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (1.0 g, 2.70 mmol) in DME (30 mL), followed by addition of 2M Na2CO3 (8 mL) and Pd(PPh3)4 (0.16 g, 0.13 mmol). The reaction mixture was degassed with N2 and heated at 80° C. for 4 h, then cooled to ambient temperature. Water was added and the mixture was extracted with EtOAc (70 mL×2). The combined organic extract was washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product. The crude product was purified by chromatography on a silica gel column eluted with 1:5 EtOAc/hexanes to give 0.785 g (63%) of 1,1-dimethylethyl 4-({[6-(4-bromo-2-fluorophenyl)-3-pyridinyl]oxy}methyl)-1-piperidinecarboxylate as an off-white solid. 1H NMR (400 MHz, CDCl3): δ 8.38 (d, 1H, J=2.6 Hz), 7.90-7.85 (m, 1H), 7.75-7.65 (m, 1H), 7.40-7.30 (m, 2H), 7.30-7.20 (m, 1H), 4.18 (bs, 2H), 3.89 (d, 2H, J=6.3 Hz), 2.85-2.70 (m, 2H), 2.05-1.95 (m, 1H), 1.90-1.80 (m, 2H), 1.46 (s, 9H), 1.35-1.25 (m, 2H); LRMS m/z 465/467 (M+H). The reaction mixture was degassed with N2 cooled to ambient temperature Water was added the mixture was extracted with EtOAc (70 mL×2) The combined organic extract was washed with brine dried over Na2SO4 filtered the filtrate was concentrated to give the crude product The crude product was purified by chromatography on a silica gel column eluted with 1:5 EtOAc/hexanes

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

Procedure: A mixture of Pd(PPh3)2Cl2 (0.42 g, 0.57 mmol) and 2-bromo-5-hydroxypyridine (1.0 g, 5.75 mmol) in DME (20 mL) was degassed with N2. 2M Na2CO3 (10 mL) was added, and the mixture was stirred at ambient temperature for 10 minutes. 4-Bromo-2-fluorobenzeneboronic acid (1.48 g, 6.61 mmol) was added. The reaction mixture was degassed again, purged with N2 and heated at 80° C. overnight, then cooled to ambient temperature, and partitioned between water and EtOAc. Concentrated HCl was added carefully to adjust aqueous pH to about 8, the mixture was filtered thought Celite®, and the EtOAc layer was separated and washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product as a dark brown oil. The crude product was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexane to give 0.168 g of 6-(4-bromo-2-fluorophenyl)-3-pyridinol as an off-white solid. The impure fractions were combined, concentrated and further purified with 1:5 acetone/hexane to give additional 78 mg of 6-(4-bromo-2-fluorophenyl)-3-pyridinol (0.246 g overall, 16% yield). 1H NMR (400 MHz, CD3OD): δ 8.20 (d, 1H, J=2.7 Hz), 7.75-7.65 (m, 1H), 7.62 (dd, 1H, Ja=8.7 Hz, Jb=2.1 Hz), 7.50-7.40 (m, 2H), 7.28 (dd, 1H, Ja=8.5 Hz, Jb=2.9 Hz); LRMS (ESI), m/z 268/270 (M+H). was degassed with N2 2M Na2CO3 (10 mL) was added The reaction mixture was degassed again purged with N2 heated at 80° C. overnight cooled to ambient temperature partitioned between water and EtOAc Concentrated HCl was added carefully the mixture was filtered the EtOAc layer was separated washed with brine dried over Na2SO4 filtered the filtrate was concentrated to give the crude product as a dark brown oil The crude product was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexane

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

Procedure: 1,1-Dimethylethyl 4-({[6-(4-bromo-2-fluorophenyl)-3-pyridinyl]oxy}methyl)-1-piperidinecarboxylate (0.23 g, ˜90% purity, 42%) was prepared as a white solid from (4-bromo-2-fluorophenyl)boronic acid (0.30 g, 1.36 mmol), 1,1-dimethylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (0.44 g, 1.19 mmol), 2M Na2CO3 (2 mL), and PdCl2(PPh3)2 (85 mg, 0.12 mmol) in DME (4 mL) in a manner similar to Example 21, Step 3. The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes. 1H NMR (400 MHz, CDCl3): δ 8.38 (d, 1H, J=2.7 Hz), 7.90-7.85 (m, 1H), 7.72 (d, 1H, J=8.8 Hz), 7.45-7.30 (m, 2H), 7.30-7.25 (m, 1H), 4.25-4.10 (m, 2H), 3.99 (d, 2H, J=6.4 Hz), 2.95-2.80 (m, 2H), 2.05-1.95 (m, 1H), 1.90-1.80 (m, 2H), 1.46 (s, 9H), 1.35-1.25 (m, 2H); LRMS (ESI), m/z 465/467 (M+H). The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes

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

Procedure: 1,1-Dimethylethyl 4-({[6-(4-bromo-2-fluorophenyl)-3-pyridinyl]oxy}methyl)-1-piperidinecarboxylate (0.23 g, ˜90% purity, 42%) was prepared as a white solid from (4-bromo-2-fluorophenyl)boronic acid (0.30 g, 1.36 mmol), 1,1-dimethylethyl 4-{[(6-bromo-3-pyridinyl)oxy]methyl}-1-piperidinecarboxylate (0.44 g, 1.19 mmol), 2M Na2CO3 (2 mL), and PdCl2(PPh3)2 (85 mg, 0.12 mmol) in DME (4 mL) in a manner similar to Example 21, Step 3. The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes. 1H NMR (400 MHz, CDCl3): δ 8.38 (d, 1H, J=2.7 Hz), 7.90-7.85 (m, 1H), 7.72 (d, 1H, J=8.8 Hz), 7.45-7.30 (m, 2H), 7.30-7.25 (m, 1H), 4.25-4.10 (m, 2H), 3.99 (d, 2H, J=6.4 Hz), 2.95-2.80 (m, 2H), 2.05-1.95 (m, 1H), 1.90-1.80 (m, 2H), 1.46 (s, 9H), 1.35-1.25 (m, 2H); LRMS (ESI), m/z 465/467 (M+H). The material was purified by chromatography on a silica gel column eluted with 20% EtOAc/hexanes

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