proteins compared to obatoclax (a pan-Bcl-2 inhibitor). These novel smallmolecules arrested the cell cycle in the G0/G1 phase, cleaved caspase-3/9, and finally prompted late apoptosis. This small molecule-mediated mitochondrial damage induced remarkably high cervical cancercell death. These unique smallmolecules can be further explored as chemical biology tools and next-generation organelle-targeted anticancer
Enantioselective Total Synthesis and Confirmation of the Absolute and Relative Stereochemistry of Streptorubin B
作者:Dennis X. Hu、Michael D. Clift、Kiel E. Lazarski、Regan J. Thomson
DOI:10.1021/ja109165f
日期:2011.2.16
cyclization/Wittig reaction and an anionic oxy-Cope rearrangement to forge the crucial 10-membered ring. Comparisons between CD spectra of synthetic and natural samples of streptorubin B coupled with X-ray crystallography allowed for the determination of the absolute stereochemistry of this natural product for the first time. These studies also provided unambiguousproof of the relative configuration between the
描述了吡咯烷天然产物链红素 B 的对映选择性全合成。简洁路线中的关键步骤包括应用一锅对映选择性羟醛环化/Wittig 反应和阴离子氧-Cope 重排,以形成关键的 10 元环。链红素 B 的合成和天然样品的 CD 光谱与 X 射线晶体学的比较,首次允许确定这种天然产物的绝对立体化学。这些研究还为丁基侧链和双吡咯亚基之间的相对构型提供了明确的证据。其他研究揭示了一种新型的阻转立体选择性 Paal-Knorr 吡咯缩合,并提供了对天然产物阻转异构化障碍的基本实验见解。
Total Synthesis and Antimalarial Activity of 2-(<i>p</i>-Hydroxybenzyl)-prodigiosins, Isoheptylprodigiosin, and Geometric Isomers of Tambjamine MYP1 Isolated from Marine Bacteria
作者:Papireddy Kancharla、Yuexin Li、Monish Yeluguri、Rozalia A. Dodean、Kevin A. Reynolds、Jane X. Kelly
DOI:10.1021/acs.jmedchem.1c00748
日期:2021.6.24
toward the first totalsynthesis of 2-(p-hydroxybenzyl)-prodigiosins (2–5), isoheptylprodigiosin (6), and geometric isomers of tambjamine MYP1 ((E/Z)-7) have been developed. The crucial steps involved in these synthetic routes are the construction of methoxy-bipyrrole-carboxaldehydes (MBCs) and a 20-membered macrocyclic core and a regioselective demethylation of MBC analogues. These new synthetic routes
已开发出高效、直接的合成路线,首次全合成 2-( p -羟基苄基)-灵菌红素 ( 2 – 5 )、异庚基灵菌红素( 6 ) 和丹巴胺 MYP1 的几何异构体 (( E / Z )- 7 ) . 这些合成路线中涉及的关键步骤是甲氧基-联吡咯-甲醛 (MBC) 和 20 元大环核心的构建以及 MBC 类似物的区域选择性去甲基化。这些新的合成路线使我们能够生成几种天然 prodiginines 24 – 27数量较多。所有合成的天然产物都在低纳摩尔浓度下对一组恶性疟原虫寄生虫表现出有效的无性血液阶段抗疟原虫活性,具有很好的治疗指数。值得注意的是,prodiginines 6和24 - 27提供固化剂的体内功效针对红细胞约氏疟原虫在25毫克/公斤×经由在鼠模型口服途径4天。在用 prodiginines 和 tambjamines 治疗的任何小鼠中均未观察到明显的临床毒性或行为变化。
Elimination of Butylcycloheptylprodigiosin as a Known Natural Product Inspired by an Evolutionary Hypothesis for Cyclic Prodigiosin Biosynthesis
作者:Brian T. Jones、Dennis X. Hu、Brett M. Savoie、Regan J. Thomson
DOI:10.1021/np400531b
日期:2013.10.25
The cyclic prodigiosins are an important family of bioactive natural products that continue to be the subject of numerous structural, synthetic, and biosynthetic studies. In particular, the structural assignments of the isomeric cyclic prodigiosins butylcycloheptylprodigiosin (BCHP) and streptorubin B have been the cause of significant confusion. Herein, we report detailed studies regarding the electron impact (El) mass spectra of synthetic BCHP and streptorubin B that have allowed us to distinguish the two compounds in the absence of quality historical isolation NMR data. On the basis of these fragmentation differences, the status of BCHP as a natural product is challenged. The proposed mechanism of fragmentation is supported by the El mass spectra of synthetic pentyl-chain analogues of BCHP and streptorubin B, X-ray crystallography, and DFT calculations. Elimination of BCHP from the prodigiosin family supports a proposed evolutionary hypothesis for the surprising biosynthesis of cyclic prodigiosins.
Application of In Situ-Generated Rh-Bound Trimethylenemethane Variants to the Synthesis of 3,4-Fused Pyrroles
作者:Erica E. Schultz、Richmond Sarpong
DOI:10.1021/ja401380d
日期:2013.3.27
Rh-bound trimethylenemethane variants generated from the interaction of a Rh-carbenoid with an allene have been applied to the synthesis of substituted 3,4-fused pyrroles. The pyrrole products are useful starting points for the syntheses of various dipyrromethene ligands. Furthermore, the methodology has been applied to a synthesis of the natural product cycloprodigiosin, which demonstrates antitumor and immunosuppressor activity.