Is 2,3,4,5-tetramethoxybenzoyl chloride a natural product?
The title compound, which was reported to be a constituent of the fruiting body of the fungus Antrodia camphorata, has been synthesized. The reactivity and spectroscopic properties of the synthetic material do not match those of the natural product. There is currently insufficient information for a definitive structural reassignment.
Chemical constituents of the gentianaceae. Part XII. Structure of the pentaoxygenated xanthones of Canscora decussata schult
The oxygenation pattern of the major pentaoxygenated xanthones of Canscora decussata is shown by synthesis and reassessment of spectrsocopic evidence, to be 1,3,5,6,7- and not 1,3,6,7,8- as previously reported. The structures of three of these xanthones are revised to 1-hydroxy-3,5,6,7-tetramethoxy-1,7-dihydroxy-3,5,6-trimethoxy-, and 1,6,7-trihydroxy-3,5-dimethoxy-xanthone, and that of a new xanthone is shown to be 1,3,7-trihydroxy-5,6-dimethoxyxanthone. The presence of minor amounts of 1,3,6,7,8-oxygenated xanthones has also been established.
Ein neues clerodan-derivat sowie weitere inhaltsstoffe aus der gattung Macowania ag
Abstract The roots of M. corymbosa afford three new benzofuran derivatives very closely related to leysseralangelicate isolated from the related genus Leyssera . The aerial parts of M. glandulosa contain, besides labdanolic acid, a new cis -clerodane derivative, its structure being elucidated by spectroscopic methods and by chemical reactions. The roots of a further Macowania species closely related to M. hamata afford a new ester related to m -thymol.