Stereochemistry of C-4 demethylation during conversion of obtusifoliol into poriferasterol by Ochromonas malhamensis
作者:Furn F. Knapp、L.John Goad、Trevor W. Goodwin
DOI:10.1016/0031-9422(71)85069-0
日期:1977.1
H 3 ] was synthesised and incubated with the chrysophyte alga Ochromonasmalhamensis which converted it into poriferasterol. A reaction sequence applied to poriferasterol showed that the tritium retained at C-4 occupied the 4α-position. This demonstrates that biological C-4 demethylation of a 4α-methylsterol precursor by O. malhamensis results in the axial 4β-hydrogen being inverted into the equatorial