N-(2-(1,1-dioxido-4-thiomorpholinyl)ethyl)-2-nitrobenzenesulfonamide (0.400 g, 1.10 mmol) was combined with cesium carbonate (0.538 g, 1.65 mmol) in DMF (5 mL). The slurry was stirred at rt for 30 min, then to it was added 1-bromo-2-methoxyethane (0.306 g, 2.20 mmol). The resulting mixture was stirred at rt for 72 h. LCMS indicated incomplete conversion, so additional 1-bromo-2-methoxyethane (0.306 g, 2.20 mmol) and cesium carbonate (0.538 g, 1.65 mmol) were added and the mixture was heated to 70° C. for 1 h. Dilution with ethyl acetate (60 mL) and water (40 mL) followed by shaking gave a separation of phases. The organic phase was isolated, washed with water (2×30 mL) and brine (25 mL), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to a residue. Purification by silica gel chromatography (gradient 100% DCM to 60:1 DCM:MeOH) gave the title compound as a yellow oil (0.486 g, 105% yield). LCMS: m/z 422 (M+H+), retention time 1.35 min (method 11). 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 2.72 (t, J=6.41 Hz, 2H) 3.01 (s, 8H) 3.21 (s, 3H) 3.39-3.52 (m, 6H) 7.62-7.66 (m, 1H) 7.66-7.74 (m, J=7.48, 7.32, 7.32, 7.32, 1.68 Hz, 2H) 8.01 (dd, J=7.78, 1.68 Hz, 1H).
