Biosynthesis of the meroterpenoid austin, by Aspergillus ustus: synthesis and incorporation of 13C,18O-labelled ethyl 3,5-dimethylorsellinate
Abstract
Ethyl 3,5-dimethylorsellinate (3) doubly labelled with 13C and 18O in the carbonyl of the carboxy group and at the C-6 position has been synthesised using a four-step procedure from sodium [1-13C, 18O2]acetate, and incorporated into austin (1) by cultures of Aspergillus ustus.