23 ネギ黒斑病病原菌Alternaria porri (Ellis) Ciferriの生産するアントラキノン二量体の単離と構造

抄録

The structure of new red pigment, alterporriol B, isolated from culture broth of Alternaria porri (Ellis) Ciferri, the fungus causing black spot disease of stone-leeks, was elucidated. Comparing its chemical and physical properties and spectral data with those of Altersolanol A (VII) and macrosporin (III), alterporriol B was supposed to be an anthraquinone dimer consisting of altersolanol A and macrosporin moiety. This assumption is well accord with the fact that (II), (III), and (IV) were obtained on the reductive decomposition reaction with Na_2S_2O_4. Considering the results of ^1H-NMR spectra, alterporriol B is probably bonded at 8-8' position of altersolanol A and macrosporin respectively.