Dichloromethane → 2-((1S)-1-(5-chloro-3-(2-(methylthio)phenyl)quinoxalin-2-yl)ethyl)isoindoline-1,3-dione

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A 5 L three-necked round-bottomed flask equipped with a mechanical stirrer, a condenser, a nitrogen gas inlet and a temperature probe was charged with DMF (2.16 L), (S)-2-(1-(3,5-dichloroquinoxalin-2-yl)ethyl)isoindoline-1,3-dione (273 g, 733 mmol) and 2-(methylthio)phenylboronic acid (136 g, 807 mmol). To the mixture, was added potassium carbonate (203 g, 147 mmol) and [1,1-bis(di-phenylphosphino)ferrocene]palladium(ii) chloride, complex with DCM (29.9 g, 36.7 mmol). The mixture was vacuum purged with N2 (2×), and heated to 100° C. The reaction was monitored by LC-MS, and deemed complete after 4 h. The reaction was cooled to rt (21° C.), and then divided into two batches. Each batch was partitioned between EtOAc (1.08 L) and water (1.35 L) in a 4 L separatory funnel After phase separation, the organic layer was washed with brine (2×500 mL) and concentrated to afford the crude product. The combined batches of crude material were loaded on silica gel and purified by flash chromatography (ISCO/RediSep™) (hexane:EtOAc=10:0 to 6:4) to provide the product as a light brown solid 320 g with 98% LC purity and 95% yield.

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