Total synthesis of 4-F3t-neuroprostane and its 4-epimer
摘要:
The first synthesis of 4-F-3t-Neuroprostane 1a and its 4-epimer is described. This molecule presents an important contribution to the study of neuronal oxidative stress in DHA-omega 3 depleted brain. The key step involves the introduction of two unsaturated side chains into the chiral polyfunctional cyclopentane 4 via E selective HWE reaction and Z selective Wittig olefination for alpha and omega chains, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
Total Synthesis of the Securinega Alkaloid (−)-Secu’amamine A
作者:Peng Liu、Sungwoo Hong、Steven M. Weinreb
DOI:10.1021/ja802700z
日期:2008.6.18
The first enantioselective total synthesis of the rearranged Securinega alkaloid (-)-secu'amamine A is reported starting from D-proline as the source of absolute chirality. The synthesis requires 15 steps starting from D-proline-derived N-trityl aldehyde 11 and proceeds in approximately 9% overall yield. Key steps include a stereoselective conjugate addition of pyrrolidino enedione 19 to afford indolizidine
据报道,以 D-脯氨酸作为绝对手性来源,首次对重排的 Securinega 生物碱 (-)-secu'amamine A 进行了对映选择性全合成。合成需要 15 个步骤,从 D-脯氨酸衍生的 N-三苯甲基醛 11 开始,并以大约 9% 的总产率进行。关键步骤包括吡咯烷烯二酮 19 的立体选择性共轭加成以提供作为主要产物的吲哚里西啶 24 和二酮酯 25 的环化/内酯化以产生四环 26。此外,对合成生物碱的 1H NMR NOE 研究和 X 射线分析已经确定吲哚里西啶部分是反式融合的。
Enantioselective Total Synthesis of (+)-Tricycloclavulone
(+)-tricycloclavulone having a unique tricyclo[5,3,0,01,4]decane skeleton and six chiral centers was achieved in a highly stereoselective manner. It includes a catalytic enantioselective [2+2]-cycloadditionreaction using novel chiral copper catalyst, extremely effecting an intramolecular ester transfer reaction, and asymmetric reduction of the carbonyl group on the alpha-chain using Noyori's chiral ruthenium catalyst
Brown's P2‐Ni does the job: An efficient synthesis of tetradeuterated neuroprostane (see structure) has been accomplished by using an ene–diyne stereoselective deuteration strategy.
The totalsynthesis of a docosahexaenoic-acid-derived prostaglandin, 4,11-diepi-4-F4t-neuroprostane, featuring a complex lateral chain was achieved for the first time. A novel prostaglandin cyclopentane skeleton obtained via an intramolecular highly selective organocatalytic Michael sequence of a formyl-enal derivative allowed the desired and exclusive thermodynamic trans configuration of the lipidic
Total Syntheses and In Vivo Quantitation of Novel Neurofuran and Dihomo-isofuran Derived from Docosahexaenoic Acid and Adrenic Acid
作者:Aurélien de la Torre、Yiu Yiu Lee、Attilio Mazzoni、Alexandre Guy、Valérie Bultel-Poncé、Thierry Durand、Camille Oger、Jetty Chung-Yung Lee、Jean-Marie Galano
DOI:10.1002/chem.201405497
日期:2015.2.2
Neurofurans (NeuroFs) and dihomo‐isofurans (dihomo‐IsoFs) are produced in vivo by non‐enzymatic free‐radical pathways from docosahexaenoic and adrenicacids, respectively. As these metabolites are produced in minute amounts, their analyses in biological samples remain challenging. Syntheses of neurofuran and dihomo‐isofurans described are based on a pivotal strategy, thanks to an enantiomerically enriched