Isolation and partial synthesis of 3-methoxycarbonyl-7-formyl-1-benzoxepin-5(2H)-one, the ester of a metabolite from shake cultures of the fungus Marasmiellus ramealis(Bull. ex Fr.) Singer

The title compound was isolated from the esterified extract of Marasmiellus ramealis shake cultures and synthesized from the corresponding natural 3,7-bis(hydroxymethyl)benzoxepinone. In addition, several known metabolites, three new to M. remealis, were isolated from the culture fluid extract.