Total synthesis of polymorphatin A, a macrocyclic bisbibenzyl with boat configured arenes
作者:Faisal A. Almalki、Wei Sun、Mark E. Light、David C. Harrowven
DOI:10.1016/j.tet.2020.131521
日期:2020.10
as to its likely existence as a natural product. Interest was rekindled when a claimed totalsynthesis revealed inconsistencies in spectral data between the synthetic sample and those reported for the natural product. Herein we describe a totalsynthesis of polymorphatin A, supported by an X-raycrystalstructure of its trimethyl ether, that adds further intrigue as our synthetic sample displays physical
Abstract Two new bis(bibenzyl) ethers, perrottetin E-11′-methyl ether and 14-hydroxyperrottetin E-11′-methyl ether were isolated from an ethyl acetate extract of the liverwort Pelliaendiviifolia together with the previously known bis(bibenzyl) ether, perrottetin E and their structures characterized by spectroscopic methods, chemical evidence and total synthesis. The present results strongly support
Perrottetin E, a cytotoxic bis(bibenzyl) ether, was isolated from and its structure determined by spectroscopic methods and total synthesis. Perrottetins F and G were also isolated from the same source and fully characterized.
Diterpenoid constituents of the liverwort Nardia subclavata
作者:Masao Toyota、Yoshinori Asakawa
DOI:10.1016/0031-9422(93)85353-s
日期:1993.10
The liverwort, Nardia subclavata, afforded two new diterpene esters, bis-[ent-16-kauren-14R-yl] malonate and a bisditerpene derived from the esterification of malonic acid by phytol and ent-16-kauren-14R-ol, in addition to perrottetin E, beta-barbatene, (-)-kolavelool and ent-16-kauren-14R-yl hydrogen malonate. Their structures were established by chemical and spectral means. Perrottetin E and ent-16-kauren-14R-yl hydrogen malonate were the major constituents of this species.