Cesium carbonate → (E)-ethyl 3-(5-(benzylthio)-2-((4-bromo-5-fluoro-2-methoxyphenyl)amino)phenyl)-acrylate

Participants

Reaction Conditions

Reaction Steps

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.

Provenance & Evidence