ethylboronic 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:

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

Procedure: 2-Bromo-4-fluoro-1-nitrobenzene (21.8 g, 100 mmol), ethyl boronic acid (7.5 g, 100 mL), K2CO3 (40 g, 300 mL), dichloro[1,1′-bis(diphenylphosphino)-ferrocene]palladium (II) (6 g) in dioxane (250 mL) and H2O (80 mL) was flushed with N2 and heated at 100° C. overnight. The reaction was diluted with EtOAc and H2O and filtered through Celite®. The organic layer was separated, concentrated and purification by flash chromatography provided the title compound (4.1 g, 24.2 mmol, 24%). 1H NMR (400 MHz, CDCl3) δ ppm 1.30 (t, J=7.78, 3H), 2.92 (q, J=7.78, 2H), 7.01-7.11 (m, 2H), 7.98 (dd, J=8.53 Hz, J=5.53 Hz, 1H). filtered through Celite® The organic layer was separated concentrated purification by flash chromatography

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

Procedure: Tetrakis(triphenylphosphine)palladium(0) (50 mg) and potassium carbonate (2.0 M, 1.0 mL) are added to a stirred solution of {3-bromo-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy)phenyl]pyrazin-2-yl}[(4-methoxyphenyl)methyl]amine (514 mg, 1.0 mmol) and ethylboronic acid (219 mg, 3.0 mmol) in toluene (8 mL). The mixture is heated to 85 C for 8 hours, cooled to room temperature, diluted with 2.0 M sodium hydroxide and extracted twice with 1:1 hexane-ethyl ether. The combined extracts are dried (sodium sulfate), filtered and concentrated. The residue is purified by flash chromatography, eluting with 20% ether in hexanes to give {3-ethyl-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy)phenyl]pyrazin-2-yl}[(4-methoxyphenyl)methyl]amine (430 mg). The mixture is heated to 85 C for 8 hours extracted twice with 1:1 hexane-ethyl ether The combined extracts are dried (sodium sulfate) filtered concentrated The residue is purified by flash chromatography eluting with 20% ether in hexanes

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

Procedure: Ethylboronic acid (0.800 g, 10.8 mmol), dichlorobis(triphenylphosphine)-palladium(II) (0.252 g, 0.360 mmol), potassium carbonate (2.50 g, 18.0 mmol) and lithium chloride (0.151 g, 3.60 mmol) are added to a mixture of methyl 3-bromo-5-[(dipropylamino)carbonyl]benzoate (1.23 g, 3.60 mmol) in dry DMF (20 mL). The mixture is heated at 100 degrees C. for 18 hours. The mixture is then partitioned between ethyl acetate and water. The phases are separated and the ethyl acetate phase is washed with saline, dried over sodium sulfate and concentrated. The concentrate is column chromatographed (silica gel; ethyl acetate/hexanes, 15/85) to give the title compound, MS (ESI+) for C17H25NO3 m/z (M+H)+=292.2. The mixture is then partitioned between ethyl acetate and water The phases are separated the ethyl acetate phase is washed with saline dried over sodium sulfate concentrated chromatographed (silica gel; ethyl acetate/hexanes, 15/85)

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

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

Procedure: A mixture of [4-(3-bromo-5-ethanesulfonyl-pyridin-2-yloxy)-6-fluoro-3-methyl-naphthalen-2-yl]-acetic acid methyl ester (42 mg, 0.085 mmol), ethylboronic acid (15 mg, 0.20 mmol), bis(triphenylphosphine)dichloropalladium(II) (7.0 mg, 0.01 mmol), potassium phosphate (64 mg, 0.30 mmol), triphenylphosphine (15.2 mg, 0.05 mmol) and toluene (1 mL) was stirred at 100° C. overnight under an argon atmosphere. The resulting mixture was filtered. The filtrate was concentrated in vacuo. The residue was purified by preparative TLC (20% ethyl acetate in petroleum ether) to afford [4-(5-ethanesulfonyl-3-ethyl-pyridin-2-yloxy)-6-fluoro-3-methyl-naphthalen-2-yl]-acetic acid methyl ester (18 mg, 47.6%) as a white solid. The resulting mixture was filtered The filtrate was concentrated in vacuo The residue was purified by preparative TLC (20% ethyl acetate in petroleum ether)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Method-2: A solution of ethyl-5,6-dibromonicotinate (6.0 g, 19.4 mmol, 1.0 eq; prepared by following the procedure described in WO2011024004), ethylboronic acid (1.72 g, 23.3 mmol, 1.2 eq) and potassium carbonate (8.0 g, 58.3 mmol, 3.0 eq) in 1,4-dioxane (10 mL) in a oven dried sealed tube was subjected to three cycles of evacuation-backfilling with argon, and then tetrakis(triphenylphosphine)palladium(0) (2.24 g, 1.94 mmol, 0.1 eq) was added. The sealed tube was sealed and the mixture was stirred and heated in an oil bath to 110° C. After three days of stirring at the same temperature, the reaction was cooled to RT and filtered through Celite®. The filtrate was evaporated and the resultant residue was purified by flash column chromatography (silica gel, ethyl acetate-hexane system as eluent) to afford 1.90 g (38%) of the desired product as a white solid. 1HNMR (400 MHz, CDCl3) δ 9.06 (d, J=1.5 Hz, 1H), 8.40 (d, J=1.5 Hz, 1H), 4.42 (q, J=7.0 Hz, 2H), 3.05 (q, J=7.0 Hz, 2H), 1.43 (t, J=7.0 Hz, 3H), 1.28 (t, J=7.0 Hz, 3H); GC-MS (m/z) 257, 259 [M+, Br79,81]. prepared dried sealed tube The sealed tube was sealed After three days of stirring at the same temperature the reaction was cooled to RT filtered through Celite® The filtrate was evaporated the resultant residue was purified by flash column chromatography (silica gel, ethyl acetate-hexane system as eluent)