Sodium Iodide → 8-(3-Morpholinopropoxy)naphthalene-2-sulfonic acid

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To a solution of 8-hydroxynaphthalene-2-sulfonic acid (Intermediate 26A, 300 mg, 1.34 mmol) and pulverized KOH (300 mg, 5.35 mmol) in DMF (2.0 mL) was added 4-(3-chloropropyl)morpholine (438 mg, 2.68 mmol) and NaI (401 mg, 2.68 mmol). The resulting reaction mixture was stirred at 60° C. for 12 h. TBAI (494 mg, 1.34 mmol) was then added followed by 4-(3-chloropropyl)morpholine (438 mg, 2.68 mmol). The reaction mixture was stirred at 60° C. for an additional 12 h, then diluted with water and filtered. The filtrate was purified directly using preparative HPLC to give the title compound (150 mg, 29%). 1H NMR (DMSO-d6) δ 8.49-8.34 (m, 1H), 7.80-7.70 (m, 1H), 7.70-7.60 (m, 1H), 7.36-7.19 (m, 2H), 6.89-6.77 (1 H, m), 3.95 (br s, 2H), 3.65 (br s, 4H), 3.48-3.32 (m, 2H), 3.26-3.06 (m, 2H), 2.57-2.44 (m, 2H), 2.37-2.13 (m, 2H); MS(ESI−) m/z 350.4 (M−H)−.

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