Biologically Active Metabolites from Fungi, 10. Generation of the Palmarumycin Spiroacetal Framework by Oxidative Cyclization of an Open Chain Metabolite from Coniothyrium palmarum

Abstract
The first “open chain” representative of the palmarumycins, the biaryl ether 1, was isolated from Coniothyrium palmarum. Phenol oxidation of 1 with silver oxide as a model for a biosynthetic step yielded 4 with the usual spiroacetal structure of the palmarumycins. The absolute (S)‐configuration of 4 (and thus of 1) was determined by quantumchemical CD calculations.

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