New methods of synthesis of N-substituted carbamates from 4-hydroxycoumarin

Article abstract of DOI:10.1055/s-1992-26260

The synthesis of a new series of compounds, the N-(methylene-4-oxocoumarinyl)carbamates 3 by condensation of carbamates 2 with 4-hydroxycoumarin (1) in the presence of ethyl orthoformate in good yields is reported.