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EXAMPLE 42 Synthesis of 2-methoxy-2'-acetylbiphenyl An oven dried resealable Schlenk tube was evacuated and backfilled with argon and charged with palladium acetate (2.2 mg, 0.01 mmol, 1.0 mol percent), 2-(di-tert-butylphosphino)biphenyl (6.0 mg, 0.020 mmol, 2.0 mol percent), 2-methoxyphenylboronic acid (228 mg, 1.5 mmol), and potassium phosphate (425 mg, 2.0 mmol). The tube was evacuated and backfilled with argon, and toluene (3 mL) and 2'-chloroacetophenone (0.13 mL, 1.0 mmol) were added through a rubber septum. The tube was sealed with a teflon screwcap, and the reaction mixture was heated to 65° C. with stirring until the starting aryl chloride had been completely consumed as judged by GC analysis. The reaction mixture was then diluted with ether (30 mL) and poured into a separatory funnel. The mixture was washed with water (20 mL), and the aqueous layer was extracted with ether (20 mL). The combined organic layers were washed with brine (20 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated. The crude material was purified by flash chromatography on silica gel to afford 201 mg (89percent) of the title compound.
201 mg (89%)
palladium diacetate; In toluene;
Example 42 Synthesis of 2-methoxy-2'-acetylbiphenyl An oven dried resealable Schlenk tube was evacuated and backfilled with argon and charged with palladium acetate (2.2 mg, 0.01 mmol, 1.0 mol percent), 2-(di-tert-butylphosphino)biphenyl (6.0 mg, 0.020 mmol, 2.0 mol percent), 2-methoxyphenylboronic acid (228 mg, 1.5 mmol), and potassium phosphate (425 mg, 2.0 mmol). The tube was evacuated and backfilled with argon, and toluene (3 mL) and 2'-chloroacetophenone (0.13 mL, 1.0 mmol) were added through a rubber septum. The tube was sealed with a teflon screwcap, and the reaction mixture was heated to 65° C. with stirring until the starting aryl chloride had been completely consumed as judged by GC analysis. The reaction mixture was then diluted with ether (30 mL) and poured into a separatory funnel. The mixture was washed with water (20 mL), and the aqueous layer was extracted with ether (20 mL). The combined organic layers were washed with brine (20 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated. The crude material was purified by flash chromatography on silica gel to afford 201 mg (89percent) of the title compound.
With potassium fluoride;palladium diacetate; In tetrahydrofuran;
EXAMPLE 41 Synthesis of 2-methoxy-4'-methylbiphenyl An oven dried resealable Schlenk tube was evacuated and backfilled with argon and charged with palladium acetate (2.2 mg, 0.01 mmol, 1.0 mol percent), 2-(di-tert-butylphosphino)biphenyl (6.0 mg, 0.020 mmol, 2.0 mol percent), 2-methoxyphenylboronic acid (228 mg, 1.5 mmol), and potassium fluoride (174 mg, 3.0 mmol). The tube was evacuated and backfilled with argon, and THF (1 mL) and 4-chlorotoluene (0.144 ml, 1.0 mmol) were added through a rubber septum. The tube was sealed with a teflon screwcap, and the reaction mixture was stirred at 65° C. until the starting aryl chloride had been completely consumed as judged by GC analysis. The reaction mixture was then diluted with ether (30 mL), filtered through celite, and concentrated. The crude material was purified by flash chromatography on silica gel to afford 188 mg (95percent) of the title compound.
188 mg (95%)
With potassium fluoride;palladium diacetate; In tetrahydrofuran;
Example 41 Synthesis of 2-methoxy-4'-methylbiphenyl An oven dried resealable Schlenk tube was evacuated and backfilled with argon and charged with palladium acetate (2.2 mg, 0.01 mmol, 1.0 mol percent), 2-(di-tert-butylphosphino)biphenyl (6.0 mg, 0.020 mmol, 2.0 mol percent), 2-methoxyphenylboronic acid (228 mg, 1.5 mmol), and potassium fluoride (174 mg, 3.0 mmol). The tube was evacuated and backfilled with argon, and THF (1 mL) and 4-chlorotoluene (0.144 mL, 1.0 mmol) were added through a rubber septum. The tube was sealed with a teflon screwcap, and the reaction mixture was stirred at 65° C. until the starting aryl chloride had been completely consumed as judged by GC analysis. The reaction mixture was then diluted with ether (30 mL), filtered through celite, and concentrated. The crude material was purified by flash chromatography on silica gel to afford 188 mg (95percent) of the title compound.
With potassium carbonate;tetrakis(triphenylphosphine) palladium(0); In water; N,N-dimethyl-formamide; at 50℃; for 12h;
Stage A: 1 -(2-methoxyphenyl)isoquinoline.A solution of <strong>[1532-71-4]1-<strong>[1532-71-4]bromoisoquinoline</strong></strong> (2.06 g, 10 mmol), prepared as described in EuropeanJournal of Organic Chemistry 2002, 4181-4184, 2-methoxyphenylboronic acid (2.79 g, 10 mmol), Pd(PPh3)4 (5percentmol), K2CO3 (5g) in DMF/water (3/1) is stirred at 500C for 12 hours.The reaction mixture is then pored on water (150 mL). The aqueous phase is extracted with EPO <DP n="84"/>ethyl acetate (3xl00mL). The combined organic layers are washed with water (3x200mL).The organic phase is dried over magnesium sulfate and evaporated under vacuum to afford the title compound.
With tetrakis(triphenylphosphine) palladium(0); potassium carbonate; In ethanol; water; toluene; at 92℃; for 3h;Inert atmosphere;
2-Bromopyridine-4-carbaldehyde (376 mg, 2.021 mmol), toluene (7 mL), K2C03 aqueous solution (2.76 g potassium carbonate dissolved in 10 mL of water, 2 mL), tetrakis(triphenylphosphine) in a 50 mL two-necked flask Palladium (45,2 mg, 0.04 mmol) was stirred under nitrogen at room temperature for 15 minutes, then 2-methoxyphenylboronic acid (407.6 mg, 2.682 mmol) in absolute ethanol (3 mL) was added and the reaction was heated at 92C. After 3 hours, the reaction system was poured into water and extracted with ethyl acetate. The ethyl acetate layers were combined, washed successively with water and saturated brine, dried over anhydrous sodium sulfate, suction-filtered, the filtrate was concentrated under reduced pressure, concentrate was separated and purified by column chromatography (petroleum ether: ethyl acetate = 6: 1) to give a white solid 406.2mg, yield 73.6%
73.6%
General procedure: To a 50 mL two-necked flask equipped with magnetic stirrer and condenser was added 2-bromopyridine (1.0 eq), Pd(PPh3)4 (5 mol%), K2CO3 solution (2.0 eq) and toluene under N2 at room temperture. After reacted for 15 min, a solution of the boronic acid (1.2 eq) in EtOH was then added. The reaction mixture was then heated to 95 C and reacted for 4 h. After cooling to room temperature, to the reaction mixture aqueous NH4Cl was added and extracted three times with EtOAc. The organic extracts were then combined, washed with brine, dried with MgSO4 and then concentrated under reduced pressure. The crude product was then purified by silica gel column chromatography(Petroleum ether/EtOAc) to give compounds 1 and 5
4-chloro-2,5-difluoro-2’-methoxy-1,1’-biphenyl[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
82%
With tetrakis(triphenylphosphine) palladium(0); potassium carbonate; In water; toluene; for 30.0h;Reflux; Inert atmosphere;
Under nitrogen, <strong>[172921-33-4]1-bromo-4-chloro-2,5-difluorobenzene</strong> (12 g, 52.8 mmol),(2-methoxyphenyl) boronic acid (8.42 g, 55.4 mmol), and potassium carbonate (14.58 g, 106 mmol)Is dissolved in a mixture of toluene (100 ml) / water (20 ml),A colorless suspension was obtained. Tetrakis (triphenylphosphine) palladium (0) (0.544 g, 0.528 mmol)Was added to the reaction mixture all at once. Degas the reaction mixture,Heated to reflux under nitrogen for 16 hours.According to the results of gas chromatograph mass spectrometry (GCMS) analysis, the reaction was not completed. Therefore,> 7 g boronic acid as catalyst, 1 g K2CO3,And 0.6 g of Pd (PPh3) 4,The resulting mixture was degassed and refluxed for 14 hours under nitrogen.The reaction mixture is then cooled, the organic phase is separated off and evaporated,Purify by silica gel column chromatography eluting with heptane as a yellow oil,4-Chloro-2,5-difluoro-2'-methoxy-1,1'-biphenyl was obtained.(11.0 g, 82% yield).
82%
With tetrakis(triphenylphosphine) palladium(0); potassium carbonate; In water; toluene; for 30.0h;Inert atmosphere; Reflux;
<strong>[172921-33-4]1-Bromo-4-chloro-2,5-difluorobenzene</strong> (12 g, 52.8 mmol), (2-methoxyphenyl)boronic acid (8.42 g, 55.4 mmol), and potassium carbonate (14.58 g, 106 mmol) were dissolved in a toluene (100 ml)/ water (20 ml) mixture under nitrogen to give a colorless suspension. Tetrakis(triphenylphosphine)palladium(0) (0.544 g, 0.528 mmol) was added to the reaction mixture in one portion. The reaction mixture was degassed and heated to reflux under nitrogen for 16 h. Based on the results of gas chromatography-mass spectroscopy (GCMS) analysis the reaction was not complete. Thus, 7 g more boronic acid, 1 g of K2CO3, and 0.6 g of Pd(PPh3)4 as catalyst was added, and the resulting mixture was degassed and refluxed under nitrogen for 14 h. The reaction mixture was then cooled down and the organic phase was separated, evaporated, and purified by column chromatography on silica gel, eluted with heptanes to yield 4-chloro-2,5-difluoro-2?-methoxy-1,1?-biphenyl (11.0 g, 82% yield) as yellow oil.
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