2-Cyano-4-nitrobenzene-1-sulfonyl chloride → Methyl 7-(2-cyano-4-nitrobenzenesulfonamido)-4-methylcoumarin-3-acetate

참여 물질

반응 단계

Methyl 7-amino-4-methylcoumarin-3-acetate (compound 1 in FIG. 2) (34.0 mg, 0.14 mmol) synthesized in Example 1(1) was dissolved in pyridine/CH2Cl2 (1.4 ml, 1:1), 2-cyano-4-nitrobenzenesulfonyl chloride (CNS chloride; 63.8 mg, 0.26 mmol, 1.9 equivalents) dissolved in CH2Cl2 (0.5 ml) was added under cooling on ice, and the mixture was stirred. The next day, the disappearance of the starting materials was confirmed by TLC and the reaction mixture was diluted with EtOAc, and partitioned between saturated aqueous NaHCO3 solution and H2O. The organic layer was washed with saturated brine and dried over Na2SO4. The solvent was evaporated, and the residue was purified by silica gel column chromatography (eluate: 1% acetic acid-containing hexane:EtOAc=1:1) (compound 2a: 32.0 mg, 0.07 mmol, 51%).

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