Unprecedented chemical structure and biomimetic synthesis of erucalexin, a phytoalexin from the wild crucifer Erucastrum gallicum
作者:M. Soledade C. Pedras、Mojmir Suchy、Pearson W. K. Ahiahonu
DOI:10.1039/b515331j
日期:——
total synthesis and antifungal activity of erucalexin, a novel phytoalexin produced by the wild crucifer dog mustard are described. Erucalexin is a structurally unique plant alkaloid, representing the first example of a spiro[2H-indole-2,5'(4'H)-thiazol]-3-one, likely derived from a C-3-C-2 carbon migration in a 3-substituted indolyl nucleus.
corresponding racemates. The absoluteconfiguration of natural (+)-2 was elucidated as R by using the direct comparison of ECD and VCD spectra with those of known (S)-(-)-spirobrassinin (1). Another chiral phytoalexin, (-)-4a, had its absoluteconfiguration 2R,3R elucidated through the comparison of observed and calculated VCD. Interestingly, the absoluteconfigurations of natural (S)-(-)-spirobrassinin
Spirocyclization strategy toward indole phytoalexins. The first synthesis of (±)-1-methoxyspirobrassinin, (±)-1-methoxyspirobrassinol, and (±)-1-methoxyspirobrassinol methyl ether
The first syntheses of cruciferous indole phytoalexins (+/-)-1-methoxyspirobrassinin, (+/-)-1-methoxyspirobrassinol, (+/-)-1-methoxyspirobrassinol methyl ether as well as a new syntheses of phytoalexins (+/-)-spirobrassinin and cyclobrassinin were achieved by dioxane dibromide (DDB)-mediated spirocyclization of brassinin and its I-substituted derivatives. (C) 2002 Elsevier Science Ltd. All rights reserved.
2′-Aminoanalogues of the cruciferous phytoalexins spirobrassinin, 1-methoxyspirobrassinin and 1-methoxyspirobrassinol methyl ether: Synthesis and anticancer properties
A method for the synthesis of new 2′-aminoanalogues of spiroindoline phytoalexins is reported. 2′-Aminonalogues of spirobrassinin, 1-methoxyspirobrassinin and 2,2′-diamino analogues of 1-methoxyspirobrassinol methylether were prepared by substitution of the methylsulphanyl group on the dihydrothiazole ring of corresponding phytoalexins. Final products were obtained by heating the phytoalexins with
报道了螺环二氢吲哚植物抗毒素新的2'-氨基类似物的合成方法。通过取代相应植物抗毒素的二氢噻唑环上的甲基硫磺酰基,制备了螺螺花青素,1-甲氧基螺花青素和2-甲氧基螺花青素甲基醚的2,2'-二氨基类似物的2'-氨基酸。在没有溶剂的情况下,将植物抗毒素与苯胺或取代的苯胺在120或140°C下加热,即可得到最终产品。通过更换SCH的3(的部分小号) - ( - ) -或(- [R)-(+)-螺油菜籽素,还合成了螺油菜籽素的2'-氨基类似物的对映体。用具有手性固定相的HPLC测定其对映体组成表明部分对映体富集。通过检查非极性C 6 D 6中的非消旋混合物,评估了我们螺旋螺素的2'-氨基类似物SIDA效应的发生。在多个1 H和13 C NMR共振中观察到两种对映体的完全对映体拆分和不同信号。提供了新的合成化合物,以测试其对一组六种人类癌细胞系的抗增殖作用。2'-氨基类似物与CF 3 功能性比天然植物抗毒素螺旋螺花青素具有更显着的抑制作用。
Spirocyclization reactions and antiproliferative activity of indole phytoalexins 1-methoxybrassinin and its 1-substituted derivatives
作者:Mariana Budovská、Martina Bago Pilátová、Viera Tischlerová、Ján Mojžiš
DOI:10.24820/ark.5550190.p009.958
日期:——
The effect of the reaction temperature and the solvent on the diastereoselectivity of the spirocyclization of 1-methoxybrassinin leading to 1-methoxyspirobrassinol methyl ether was studied. 1-Acyl derivatives of 1-methoxyspirobrassinol and 1-methoxyspirobrassinol methyl ether were prepared by the bromine-mediated spirocyclization reactions of derivatives of brassinin bearing an acyl group on the indole