Oxidation of 3-Cinnamoyltropolones with Alkaline Hydrogen Peroxide.

Abstract

Nine 3-cinnamoyltropolones 1 a-i were oxidized with hydrogen peroxide in the presence of alkali to afford 2-benzylidene-3, 8-dihydro-2H-cyclohepta [b] furan- 3, 8 -diones 4 a-i, which have an aurone-like structure. In some cases, methoxy-substituted benzaldehydes and/or phenols were isolated, besides 4.