Rearrangement and oxidation of β-amyrin promoted by growing cells of Lecanicillium muscarinium
摘要:
Microbial transformation of -amyrin by growing cells of the fungus Lecanicillium muscarinium (former Cephalosporium aphidicola) was successfully accomplished after 15 days of incubation with orbital shaking at 120 rpm. Two products purified by column chromatography were identified by 1H and 13C mono- and bi-dimensional nuclear magnetic resonance as 3-hydroxy-olean-12-en-11-one and 11,12-oxidotaraxerol; these later formed new compounds formed by an interesting oxidative rearrangement of the starting material, probably via an initial hydroxylation at C-11.