反应详情

A mixture of ethyl 7-hydroxy-4-oxo-4H-chromene-2-carboxylate (10 g, 41 mmol) in MeOH (20 ml) and AcOH (20 ml) was hydrogenated at 50 Psi for 4 days. Filtration and evaporation gave the title compound. Yield: 9.2 g. MS m/z (rel. intensity, 70 eV) 222 (M+, 44), 149 (bp), 148 (22), 147 (46), 121 (25).

1. filtrationFiltration and evaporation