Facile Synthesis of 4-Hydroxycoumarins by Sulfur-Assisted Carbonylation of 2'-Hydroxyacetophenones with Carbon Monoxide

Article abstract of DOI:10.1055/s-1988-27537

4-Hydroxycoumarins (4-hydroxy-2-oxo-2H-1-benzopyrans) were synthesized in good to excellent yields by C-carbonylation of 2'-hydroxyacetophenones with carbon monoxide in the presence of sulfur and bases.This is the first example of sulfur-assisted C-carbonylation with carbon monoxide.