Potassium Carbonate → N-(4-(3,4-dimethoxyphenyl)-4-(1,3-dioxo-4-(4-((R)-1-phenylethyl)piperazin-1-yl)isoindolin-2-yl)butyl)thiophene-2-sulfonamide

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A 10-mL round bottom flask was charge with Compound 66 (20.0 mg, 0.04 mmol), potassium carbonate (8.0 mg, 0.06 mmol), and dichloromethane (0.5 mL). Thiophene-2-sulfonyl chloride (8.0 mg, 0.04 mmol) was added and the mixture was stirred at room temperature for 4 h. The mixture was concentrated in vacuo and purified via flash chromatography (230-400 mesh silica gel 60, gradient 100:0-95:5 CH2Cl2:methanol) to give 9.8 mg of Compound 68 as a yellow solid. 1H NMR (300 MHz, CDCl3) δ 7.71-7.74 (m, 1 H), 7.51-7.61 (m, 3 H), 7.29-7.38 (m, 6 H), 7.02-7.18 (m, 3 H), 6.73-6.80 (m, 1 H), 5.10-5.17 (m, 1 H), 4.50-4.57 (m, 1 H), 3.86 (s, 3H), 3.83 (s, 3 H), 3.31-3.39 (m, 4 H), 3.06-3.11 (m, 4 H), 2.65-2.74 (m, 2 H), 2.45-2.55 (m, 1 H), 2.20-2.31 (m, 1 H), 1.58-1.63 (m, 2 H), and 1.49 (d, J=6.8 Hz, 3 H); MS (ES+) 689 (M+1).

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