Antimicrobial agents from higher plants: two dimethylbenzisochromans from Karwinskia humboldtiana
作者:Lester A. Mitscher、Sitaraghav R. Gollapudi、David S. Oburn、Steven Drake
DOI:10.1016/s0031-9422(00)82534-0
日期:1985.1
Abstract Two new antimicrobial dimethylbenzisochromans were isolated from the roots of Karwinskia humboldtiana together with the known 7-acetyl-6,8-dimethoxy-3-methyl-l-naphthol. The structures and absolute configurations were determined by spectroscopic examination and by chemical transformation to the known quinones eleutherin and 7-methoxyeleutherin.
Biomimetic studies towards the cardinalins: synthesis of (+)-ventiloquinone L and an unusual dimerisation
作者:Jonathan Sperry、Jimmy J. P. Sejberg、Frank M. Stiemke、Margaret A. Brimble
DOI:10.1039/b905077a
日期:——
Studiestowards the biomimetic synthesis of cardinalin 3 are described. Despite the successful enantioselective synthesis of the monomeric pyranonaphthoquinone ventiloquinone L, it subsequently failed to undergo a proposed biomimetic homodimerisation to cardinalin 3 using a range of oxidants. However, treatment of a related naphthopyran with cerium ammonium nitrate (CAN) facilitated a tandem biaryl