(2,6-diethylphenyl)boronic acid

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

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

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

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

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

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

Procedure: A mixture of (2,6-dichloro-3-{[methyl-(1,2,3,4-tetrahydro-naphthalen-1-yl)-amino]-methyl}-pyridin-4-yl)-pyrrolidin-1-yl-methanone (200 mg, 0.48 mmol), 2,6-diethyl-phenyl boronic acid (85 mg, 0.48 mmol), Na2CO3 (2 M aqueous solution, 0.48 mL, 0.96 mmol), and Pd(PPh3)4 (50 mg) is refluxed in toluene (10 mL) for 18 hours and cooled to room temperature. Methylboronic acid (286 mg, 4.78 mmol), Na2CO3 (2 M aqueous solution, 0.48 mL, 0.96 mmol), and Pd(PPh3)4 (50 mg) are added to the mixture. The resulting mixture is refluxed in toluene for another 18 hours and then cooled to room temperature. Hexane (20 mL) and 1 N NaOH (2 mL) are added. The organic layer is separated, washed with brine, dried over sodium sulfate, and solvent removed. The crude product is purified by flash column (4:1 hexane:EtOAc) to give (6-(2,6-diethyl-phenyl)-2-methyl-3-{[methyl-(1,2,3,4-tetrahydro-naphthalen-1-yl)amino]-methyl}-pyridin-4-yl)-pyrrolidin-1-yl-methanone. 1H NMR (CDCl3) 7.51 (m, 1H), 7.28 (m, 1H), 7.14-6.98 (m, 6H), 4.02-3.80 (m, 3H), 3.65 (m, 2H), 3.25 (m, 2H), 2.75-2.34 (m, 5H), 2.10 (m, 4H), 2.05-1.85 (m, 9H), 1.76 (m, 2H), 1.03 (t, 6H). cooled to room temperature The organic layer is separated washed with brine dried over sodium sulfate, and solvent removed The crude product is purified by flash column (4:1 hexane:EtOAc)

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

Procedure: A mixture of (2,6-dichloro-3-{[methyl-(1,2,3,4-tetrahydro-naphthalen-1-yl)-amino]-methyl}-pyridin-4-yl)-pyrrolidin-1-yl-methanone (200 mg, 0.48 mmol), 2,6-diethyl-phenyl boronic acid (85 mg, 0.48 mmol), Na2CO3 (2 M aqueous solution, 0.48 mL, 0.96 mmol), and Pd(PPh3)4 (50 mg) is refluxed in toluene (10 mL) for 18 hours and cooled to room temperature. Methylboronic acid (286 mg, 4.78 mmol), Na2CO3 (2 M aqueous solution, 0.48 mL, 0.96 mmol), and Pd(PPh3)4 (50 mg) are added to the mixture. The resulting mixture is refluxed in toluene for another 18 hours and then cooled to room temperature. Hexane (20 mL) and 1 N NaOH (2 mL) are added. The organic layer is separated, washed with brine, dried over sodium sulfate, and solvent removed. The crude product is purified by flash column (4:1 hexane:EtOAc) to give (6-(2,6-diethyl-phenyl)-2-methyl-3-{[methyl-(1,2,3,4-tetrahydro-naphthalen-1-yl)amino]-methyl}-pyridin-4-yl)-pyrrolidin-1-yl-methanone. 1H NMR (CDCl3) 7.51 (m, 1H), 7.28 (m, 1H), 7.14-6.98 (m, 6H), 4.02-3.80 (m, 3H), 3.65 (m, 2H), 3.25 (m, 2H), 2.75-2.34 (m, 5H), 2.10 (m, 4H), 2.05-1.85 (m, 9H), 1.76 (m, 2H), 1.03 (t, 6H). cooled to room temperature The organic layer is separated washed with brine dried over sodium sulfate, and solvent removed The crude product is purified by flash column (4:1 hexane:EtOAc)

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

Procedure: A mixture of 6-chloro-4-methoxy-nicotinic acid methyl ester (4.0 g, 19.8 mmol), 2,6-diethylphenyl boronic acid (7.0 g, 39.3 mmol), Na2CO3 (2M in H2O, 39 mL) and Pd(PPh3)4 (2.0 g, 1.7 mmol) in toluene (200 mL) is heated overnight at 80° C. under argon. On cooling, hexane (200 mL) is added and the organic layer separated. The organic layer is washed with 1N NaOH and water, dried (Na2SO4) and concentrated. The residue is purified by silica gel column (hexane/EtOAc 4:1) to give 6-(2,6-diethyl-phenyl)-4-methoxy-nicotinic acid methyl ester. 1H NMR (CDCl3) 8.99 (s, 1H), 7.30 (m, 1H), 7.15 (d, 2H), 6.89 (s, 1H), 3.95 (s, 3H), 3.94 (s, 3H), 2.34 (m, 4H), 1.06 (t, 6H). On cooling the organic layer separated The organic layer is washed with 1N NaOH and water dried (Na2SO4) concentrated The residue is purified by silica gel column (hexane/EtOAc 4:1)

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

Procedure: A mixture of 6-chloro-4-methoxy-nicotinic acid methyl ester (4.0 g, 19.8 mmol), 2,6-diethylphenyl boronic acid (7.0 g, 39.3 mmol), Na2CO3 (2M in H2O, 39 mL) and Pd(PPh3)4 (2.0 g, 1.7 mmol) in toluene (200 mL) is heated overnight at 80° C. under argon. On cooling, hexane (200 mL) is added and the organic layer separated. The organic layer is washed with 1N NaOH and water, dried (Na2SO4) and concentrated. The residue is purified by silica gel column (hexane/EtOAc 4:1) to give 6-(2,6-diethyl-phenyl)-4-methoxy-nicotinic acid methyl ester. 1H NMR (CDCl3) 8.99 (s, 1H), 7.30 (m, 1H), 7.15 (d, 2H), 6.89 (s, 1H), 3.95 (s, 3H), 3.94 (s, 3H), 2.34 (m, 4H), 1.06 (t, 6H). On cooling the organic layer separated The organic layer is washed with 1N NaOH and water dried (Na2SO4) concentrated The residue is purified by silica gel column (hexane/EtOAc 4:1)

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

Procedure: A mixture of 4,6-dichloro-2-trifluoromethyl-nicotinic acid methyl ester (1.0 g, 3.7 mmol), 2,6-diethyl-phenyl boronic acid (0.78 g, 4.4 mmol), sodium carbonate (2 M aqueous solution, 4.4 mL, 8.8 mmol), and Pd(PPh3)4 (206 mg, 0.18 mmol) is refluxed in toluene for 48 hours and then cooled to room temperature. The organic layer is separated and the aqueous layer is extracted with ethyl acetate (2×50 mL). The combined organic layers are dried and the solvent removed. The crude product is purified by flash column (hexanes/ethyl acetate 8:1) to give 4-chloro-6-(2,6-diethylphenyl)-2-trifluoromethyl-nicotinic acid methyl ester as a white solid. 1H NMR: (CDCl3) 7.58 (s, 1H), 7.25 (t, 1H), 7.20 (d, 2H), 4.02 (s, 2.28 (q, 4H), 1.04 (t, 6H). The organic layer is separated the aqueous layer is extracted with ethyl acetate (2×50 mL) The combined organic layers are dried the solvent removed The crude product is purified by flash column (hexanes/ethyl acetate 8:1)

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

Procedure: A mixture of 4,6-dichloro-2-trifluoromethyl-nicotinic acid methyl ester (1.0 g, 3.7 mmol), 2,6-diethyl-phenyl boronic acid (0.78 g, 4.4 mmol), sodium carbonate (2 M aqueous solution, 4.4 mL, 8.8 mmol), and Pd(PPh3)4 (206 mg, 0.18 mmol) is refluxed in toluene for 48 hours and then cooled to room temperature. The organic layer is separated and the aqueous layer is extracted with ethyl acetate (2×50 mL). The combined organic layers are dried and the solvent removed. The crude product is purified by flash column (hexanes/ethyl acetate 8:1) to give 4-chloro-6-(2,6-diethylphenyl)-2-trifluoromethyl-nicotinic acid methyl ester as a white solid. 1H NMR: (CDCl3) 7.58 (s, 1H), 7.25 (t, 1H), 7.20 (d, 2H), 4.02 (s, 2.28 (q, 4H), 1.04 (t, 6H). The organic layer is separated the aqueous layer is extracted with ethyl acetate (2×50 mL) The combined organic layers are dried the solvent removed The crude product is purified by flash column (hexanes/ethyl acetate 8:1)

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

Procedure: A mixture of 4,6-dichloro-2-methyl-nicotinic acid ethyl ester (1.2 g, 5.1 mmol), 2,6-diethyl-phenyl boronic acid (2.18 g, 12.2 mmol), sodium carbonate (2 M aqueous solution, 12.2 mL, 24.4 mmol), and Pd(PPh3)4 (284 mg, 0.26 mmol) is refluxed in toluene for 48 hours and then cooled to room temperature. The organic layer is separated and the aqueous layer is extracted with ethyl acetate (2×50 mL). The organic Layers are combined, dried, and solvent removed. The crude product is purified by flash column (hexanes/ethyl acetate 8:1) to give 4-chloro-6-(2,6-diethyl-phenyl)-2-methyl-nicotinic acid ethyl ester. 1H NMR: (CDCl3) 7.26 (t, 1H), 7.18 (s, 1H), 7.13 (d, 2H), 4.47 (q, 2H), 2.62 (s, 3H), 2.28 (q, 4H), 1.44 (t, 3H), 1.04 (t, 6H). The organic layer is separated the aqueous layer is extracted with ethyl acetate (2×50 mL) dried solvent removed The crude product is purified by flash column (hexanes/ethyl acetate 8:1)