Benzenesulfonyl hydrazide → Methyl 4-(4-oxo-chroman-3-ylmethyl)-benzoate

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A suspension of 260 (400 mg, 1.36 mmol) and benzenesulfonyl hydrazine (702 mg, 4.08 mmol) in DMF (7 ml) was stirred at 100° C. during 48 h. The solvent was evaporated and the residue was diluted in AcOEt, washed with NH4Cl sat., brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx)to afford the title compound 264 (170 mg, 42%) as a white solid. LRMS: 296.1 (Calc.); 297.0 (found).

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