Eleganketal A, a Highly Oxygenated Dibenzospiroketal from the Marine-Derived Fungus Spicaria elegans KLA03
摘要:
Eleganketal A (1), a naturally occurring aromatic polyketide possessing a rare highly oxygenated spiro[isobenzofuran-1,3'-isochroman] ring system, was isolated from the fungus Spicaria elegans KLA03 by culturing it in a modified mannitol-based medium. The structure of 1 including the absolute configuration was determined by combining spectroscopic analysis, synthesis of the racemic permethylated analogue, chiral-phase HPLC separation, and TDDFT-ECD analysis.
Eleganketal A, a Highly Oxygenated Dibenzospiroketal from the Marine-Derived Fungus Spicaria elegans KLA03
摘要:
Eleganketal A (1), a naturally occurring aromatic polyketide possessing a rare highly oxygenated spiro[isobenzofuran-1,3'-isochroman] ring system, was isolated from the fungus Spicaria elegans KLA03 by culturing it in a modified mannitol-based medium. The structure of 1 including the absolute configuration was determined by combining spectroscopic analysis, synthesis of the racemic permethylated analogue, chiral-phase HPLC separation, and TDDFT-ECD analysis.
Asymmetric total synthesis of dibenzocyclooctadiene lignans (-)-schizandrin and (-)-isoschizandrin. Structure revision of (+)-isoschizandrin
作者:Alan M. Warshawsky、A. I. Meyers
DOI:10.1021/ja00178a037
日期:1990.10
The oxazoline-mediated biaryl coupling reaction was applied successfully to the totalsynthesis of a series of dibenzocyclooctadiene lignans in chiral nonracemic form. The diastereoselectivities achieved in the coupling reaction varied in a predictable manner, primarily as a function of the ortho substituents on the phenyl Grignard reagent