Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1) → HCID 16122395, 화합물

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Andrographolide (150 mg, 0.43 mmol) was dissolved in a mixture solution of 2,2-dimethoxypropane (0.2 mL), pyridinium p-toluene-sulfonate (3 mg) and toluene/DMSO (3 mL/0.4 mL), stirred at 80° C. for 1 hour, and cooled to room temperature at the end. The reaction was terminated by using triethylamine (0.1 mL), the reaction mixture was diluted with toluene (20 mL), washed with water (3×5 mL), the organic layer was dried using anhydrous Na2SO4 and concentrated, and the obtained white solid was washed with ethyl ether and filtrated to obtain the compound 1 (130 mg, 78%) (Srinivas et al., Bioorg. Med. Chem. Lett. 2004, 14, 4711-4717).

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