1-溴-2-氟-4-碘-5-甲氧基苯

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A RBF was charged with 4-(benzylthio)-2-nitroaniline (13.72 g, 47.4 mmol), 1-bromo-2-fluoro-4-iodo-5-methoxybenzene (17.27 g, 52.2 mmol), Xantphos (1.372 g, 2.372 mmol), Pd2(dba)3 (1.086 g, 1.186 mmol), CPME (95 ml) and cesium carbonate (23.18 g, 71.2 mmol) were added. A reflux condenser was attached and the flask was lowered into a 90° C. heating bath. The mixture was stirred overnight. In the morning, the solid was scraped of the bottom of the flask, and an additional portion of cesium carbonate (23.18 g, 71.2 mmol) was added. The flask was returned to the heat with vigorous stirring for 3 h. After cooling, the mixture was diluted with EtOAc and filtered through celite with the aid of EtOAc. The filtrate was concentrated, and the residue was dissolved in DCM and loaded onto a pre-equilibrated 340-g SNAP Ultra column. The column was eluted with 0-30% EtOAc/Heptane. The material crashed out on the column, so the elution was changed to 0-50% EtOAc/Heptane with 10% DCM. The eluent was raised to 100% EtOAc, 20% DCM. Fractions containing product were combined and concentrated to give 22.96 g (>100% yield) of N-(4-(benzylthio)-2-nitrophenyl)-4-bromo-5-fluoro-2-methoxyaniline as a red solid that was 80-90% pure by LCMS. m/z (ESI) 563.0 (M+H)+. were added A reflux condenser was attached was lowered into a 90° C. heating bath heat with vigorous stirring for 3 h After cooling filtered through celite with the aid of EtOAc The filtrate was concentrated the residue was dissolved in DCM The column was eluted with 0-30% EtOAc/Heptane so the elution The eluent was raised to 100% EtOAc, 20% DCM Fractions containing product concentrated

反应条件: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of (E)-ethyl 3-(2-amino-5-(benzylthio)phenyl)acrylate (300 g, 958.1 mmol, 1.0 equiv) and 1-bromo-2-fluoro-4-iodo-5-methoxybenzene (348.0 g, 1051.6 mmol, 1.1 equiv) in toluene (2.5 L) was added Cs2CO3 (468 g, 1436.3 mmol, 1.5 equiv, Spectrochem) and the mixture was degassed with nitrogen for 20 mins. Pd2(dba)3 (35 g, 38.2 mmol, 0.04 equiv, Hindustan Platinum) and XantPhos (44.6 g, 76.4 mmol, 0.08 equiv, GLR) were added to the reaction mixture and the mixture was heated at 110° C. for 5 h. The reaction mixture was allowed to cool to room temperature, diluted with dichloromethane (2.0 L) and filtered through celite. The filtrate was concentrated under reduced pressure to obtain the crude material which was purified by stirring with 5% ethyl acetate in hexanes (3.0 L) for 30 min and filtered to obtain (E)-ethyl 3-(5-(benzylthio)-2-((4-bromo-5-fluoro-2-methoxyphenyl)amino)phenyl)acrylate (350 g, 71%) as yellow solid. TLC solvent system: 30% ethyl acetate in hexanes. Product's Rf: 0.5. MS (ESI, positive ion) m/z; 516.2 (M+1). 1H NMR (400 MHz, DMSO) δ 7.73-7.61 (m, 3H), 7.34-7.15 (m, 6H), 7.02 (d, J=11.4 Hz, 1H), 6.60 (d, J=21.2 Hz, 1H), 6.33 (d, J=14.1 Hz, 1H), 4.26 (s, 2H), 4.16-4.09 (m, 2H), 3.81 (s, 3H), 1.22 (t, J=7.2 Hz, 3H). Note: NH proton not observed. the mixture was degassed with nitrogen for 20 mins to cool to room temperature filtered through celite The filtrate was concentrated under reduced pressure to obtain the crude material which was purified filtered

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 2-bromo-1-fluoro-4-methoxybenzene (500.0 g, 2.44 mol, 1.0 equiv) in DCM (5.0 L) was added silver trifluoromethane sulfonate (686.0 g, 2.68 mol, 1.1 equiv, Angene) and the reaction mixture was stirred for 20 mins. Iodine (678.0 g, 2.68 mol, 1.1 equiv) was added to the reaction and the mixture was stirred at room temperature for 16 h. The mixture was diluted with DCM (3.0 L) and filtered through celite. The celite bed was washed with DCM (2×1.0 L) and the filtrate was washed with 20% aqueous sodium thiosulfate (3.0 L) and saturated aqueous sodium bicarbonate solution (3.0 L). The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure to obtain the crude material which was purified by chromatography (silica gel; mesh size 60-120, elution 0-5% ethyl acetate and petroleum ether) to get 1-bromo-2-fluoro-4-iodo-5-methoxybenzene (720 g, 87%), as off-white solid. TLC solvent system: 100% hexanes. Product's Rf: 0.6. MS (ESI, positive ion) m/z: 331.0 (M+1). 1H NMR (400 MHz, CDCl3) δ 7.55 (d, J=7.2 Hz, 1H), 6.95 (d, J=5.6 Hz, 1H), 3.89 (s, 3H). the mixture was stirred at room temperature for 16 h filtered through celite The celite bed was washed with DCM (2×1.0 L) the filtrate was washed with 20% aqueous sodium thiosulfate (3.0 L) and saturated aqueous sodium bicarbonate solution (3.0 L) The organic layer was dried over sodium sulfate filtered concentrated under reduced pressure to obtain the crude material which was purified by chromatography (silica gel; mesh size 60-120, elution 0-5% ethyl acetate and petroleum ether)

反应条件: temp:130.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A screw cap vial was charged with (E)-ethyl 3-(2-amino-5-(benzylthio)phenyl)acrylate (0.500 g, 1.595 mmol), xantphos (0.185 g, 0.319 mmol), Pd2(dba)3 (0.146 g, 0.160 mmol), sodium tert-butoxide (0.153 g, 1.595 mmol) and toluene (7.98 ml). The vial was purged with Argon, sealed and heated to 130° C. for 10 minutes. The reaction was cooled to RT and 1-bromo-2-fluoro-4-iodo-5-methoxybenzene (0.581 g, 1.755 mmol) was added and the reaction was continued heating at 100° C. for an additional 30 minutes. The reaction was cooled to RT, diluted with water and extracted with DCM (3×). The combined organics were washed with water and brine, dried over magnesium sulfate, filtered and concentrated. The resulting material was concentrated, dissolved in minimal DCM and purified via column chromatography (silica gel 40 g, gradient elution 0 to 50% EtOAc:Heptane) to afford 0.40 g of (E)-ethyl 3-(5-(benzylthio)-2-((4-bromo-5-fluoro-2-methoxyphenyl)amino)phenyl)acrylate (0.400 g, 0.775 mmol, 48.6% yield). m/z (ESI) 471.0 A screw cap vial The vial was purged with Argon sealed The reaction was cooled to RT the reaction was continued heating at 100° C. for an additional 30 minutes The reaction was cooled to RT extracted with DCM (3×) The combined organics were washed with water and brine dried over magnesium sulfate filtered concentrated The resulting material was concentrated dissolved in minimal DCM purified via column chromatography (silica gel 40 g, gradient elution 0 to 50% EtOAc:Heptane)