Thionyl Chloride → 4-Benzoylamino-naphthalene-1-sulfonyl chloride

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To a solution of the pyridinium salt of 4-benzoylamino-napthalene-1-sulfonic acid (2.4 g, 5.9 mmol) in DMF (10 mL), was added thionyl chloride (0.6 mL, 8.8 mmol). The resultant solution was stirred at 25° C. for 3 hours. The reaction mixture was quenched by pouring into ice water and filtered to give the title compound (1.8 g) a pale white solid. This material was used without further purification. 1H NMR (300 MHz, DMSO) δ 8.88 (d, 1H), 8.09 (d, 2H), 7.97 (d, 2H), 7.55 (m, 6H).

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