Potassium Carbonate → 1-[2-Methyl-5-(ethyloxy)-4-nitrophenyl]-4-[2-(methylsulfonyl)ethyl]piperazine

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1-Methyl-2-fluoro-4-(ethyloxy)-5-nitrobenzene (Example 215, step A) (5.74 g, 28.8 mmol) was dissolved in DMSO (60 mL). K2CO3 (11.9 g, 86.4 mmol) and 1-[2-(methylsulfonyl)ethyl]piperazine hydrochloride (Example 148, step B) (9.85 g, 43.2 mmol) were added and the reaction mixture was heated to 100° C. and allowed to stir overnight. The mixture was cooled to rt then diluted with DCM and filtered. The filtrate was poured into H2O and extracted with DCM. The combined organics were dried with MgSO4, filtered, and concentrated in vacuo to give the title compound of Step A (9.70 g, 26.1 mmol, 90%) as an orange solid. 1H NMR (400 MHz, CDCl3) δ 7.75 (s, 1H), 6.51 (s, 1H), 4.11 (q, J=7.0 Hz, 2H), 3.16 (t, J=6.5 Hz, 2H), 3.03 (s, 3H), 3.00-2.91 (m, 6H), 2.72-2.62 (m, 4H), 2.21 (s, 3H), 1.44 (t, J=7.0 Hz, 3H).

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