Three new metabolites (citreoviral, citreodiol, and epicitreodiol) have been isolated from the mycelium of Penicillium citreo-viride B.(IFO 6050) and their stereostructures have been elucidated on the basis of their spectral data coupled with some chemical evidence. Furthermore, the absolute configurations of citreodiol and epicitreodiol have been determined by syntheses of the corresponding antipodes
Silyl-Substituted Spirodiepoxides: Stereoselective Formation and Regioselective Opening
作者:Partha Ghosh、Joseph R. Cusick、Jennifer Inghrim、Lawrence J. Williams
DOI:10.1021/ol901948d
日期:2009.10.15
A short synthesis of the natural product epi-citreodiol and the method developed to gain access to this target are described. Key advances focus on silyl substituted allenes. Upon exposure to dimethyldioxirane, spirodiepoxides form with high face selectivity and subsequently react at the silyl terminus.
Blockage of the early step of lankacidin biosynthesis caused a large production of pentamycin, citreodiol and epi-citreodiol in Streptomyces rochei
Streptomyces rochei, three UV-active compounds were isolated from mutant FS18, a gene disruptant of lkcA encoding a non-ribosomal peptide synthetase (NRPS)-polyketide synthase (PKS) hybrid enzyme. Their structures were elucidated on the basis of spectroscopic data of NMR and MS. Two compounds of a higher mobile spot on silica gel TLC (Rf=0.45 in CHCl3-MeOH=20:1) were determined to be an epimeric mixture of