Aromatic or heteroaromatic hydrocarbons are easily alkylated with 3-hydroxy
-3H-benzofuran-2-ones under Friedel-Crafts or acid catalysis to afford 3-ar
yl-3H-benzofuran-2-ones in good yield. Access to the starting 3-hydroxy-3H-
benzofuran-2-ones is easily achievable by reaction of suitably substituted
phenols with glyoxylic acid.