The biosynthesis of fungal metabolites. Part IX. Sclerin: feedings with [1,2-13C]acetate and [methyl-13C]methionine
Abstract
The 13C n.m.r. spectra of methyl 2-(3-hydroxy-2-methoxycarbonyl-4,5,6-trimethylphenyl)propionate (II) derived from the fungal metabolite sclerin (I) enriched with 13C from [1,2-13C]acetate or from [methyl-13C]-methionine, establish that the metabolite is derived from two β-ketide precursors with the introduction of three C-methyl groups from methionine.