Two novel bis(bibenzyls) named paleatins A (1) and B (2) have been isolated from the liverwort, Marchantia paleacea var. diptera. Their structures have been establishied by a combination of high-resolution NMR spectra and chemical degradation. A total synthesis of paleatin A has been accomplished in ten steps.
从肝草 Marchantia paleacea var.通过高分辨率核磁共振光谱和化学降解相结合的方法,确定了它们的结构。苍术素 A 的全合成分十步完成。
Total syntheses of marchantin A and riccardin B, cytotoxic bis(bibenzyls) from liverworts
Chemical and biocatalytic synthesis of seven previously undescribed marchantin A esterderivatives has been presented. Chemical synthesis afforded three peresterified bisbibenzyl products (TE1-TE3), while enzymatic method, using lipase, produced regioselective monoester derivatives (ME1-ME4). The antiproliferativeactivities of all prepared derivatives of marchantin A were tested on MRC5 healthy human