Quinone methide initiated cyclization reactions: Studies toward the synthesis of (+)-pancratistatin
摘要:
The synthesis of highly functionalized cyclohexenone 15, a possible precursor for (+)-pancratistatin, was accomplished in 15 steps (10% yield) from aldehyde 4 via a quinone methide initiated cyclization reaction.
Leveraging Open Science Drug Development for PET: Preliminary Neuroimaging of <sup>11</sup>C-Labeled ALK2 Inhibitors
作者:Emily Murrell、Junchao Tong、David Smil、Taira Kiyota、Ahmed M. Aman、Methvin B. Isaac、Iain D. G. Watson、Neil Vasdev
DOI:10.1021/acsmedchemlett.1c00127
日期:2021.5.13
cancer, diffuse intrinsic pontine glioma (DIPG). Inhibitors of ALK2 that cross the blood–brain barrier have been proposed as a method of treatment for DIPG. As part of an open science approach to radiopharmaceutical and drugdiscovery, we developed 11C-labeled radiotracers from potent and selective lead ALK2 inhibitors to investigate their brain permeability through positron emission tomography (PET)
Divergent Total Syntheses of Gymnothelignan N, Beilschmin A, and Eupomatilones 1, 3, 4, and 7
作者:Hosam Choi、Joohee Choi、Jongyeol Han、Kiyoun Lee
DOI:10.1021/acs.joc.1c03167
日期:2022.3.18
same chiral γ-butyrolactone intermediate permitted the rapid and effective divergent assembly of optically active eupomatilones 1, 3, 4, and 7 in five or six steps from commercially available materials. This represents one of the shortest and highest-yielding syntheses reported to date.
本报告详细介绍了gymnothelignan N 的七步不对称全合成。该方法基于早期的单碳同源内酯化反应,我们最近对其进行了重新审视和修改,以构建具有必需的 β,γ-邻位立体中心的核心 γ-丁内酯基序。通过设计,使用相同的手性 γ-丁内酯中间体允许从市售材料中通过五到六个步骤快速有效地组装光学活性的 eupomatilones 1、3、4 和 7。这代表了迄今为止报道的最短和最高产率的合成方法之一。
An expedient copper-catalysed asymmetric synthesis of γ-lactones and γ-lactams. Application to the synthesis of lucidulactone A
作者:O. Stephen Ojo、David L. Hughes、Christopher J. Richards
DOI:10.1039/d3ob00563a
日期:——
The parent Josiphos ligand gave excellent ee values (95–99%) and good yields (60–97%) in the copper-catalysed asymmetric conjugate reduction of β-aryl α,β-unsaturated lactones and lactams with PMHS. The substrates were obtained from stereospecific copper-catalysed addition of arylboronic acids to alkynoates followed by deprotection and cyclisation. The acyclic lactam precursors also underwent reduction
母体 Josiphos 配体在铜催化的 β-芳基 α,β-不饱和内酯和内酰胺与 PMHS 的不对称共轭还原反应中具有优异的 ee 值 (95–99%) 和良好的产率 (60–97%)。底物是通过铜催化的立体定向加成将芳基硼酸加成炔酸酯,然后脱保护和环化获得的。无环内酰胺前体也经历了还原,具有良好的 ee 值 (83–85%) 和收率 (79–95%)。这种不对称还原方法的应用包括天然产物 lucidulactone A 的合成。
Banwell, Martin G.; Cameron, Jennifer M.; Collis, Maree P., Australian Journal of Chemistry, 1991, vol. 44, p. 705 - 728
作者:Banwell, Martin G.、Cameron, Jennifer M.、Collis, Maree P.、Crisp, Geoffrey T.、Gable, Robert W.、et al.
DOI:——
日期:——
Banwell, Martin G.; Cameron, Jennifer M.; Collis, Maree P., Australian Journal of Chemistry, 1991, vol. 44, # 5, p. 705 - 728
作者:Banwell, Martin G.、Cameron, Jennifer M.、Collis, Maree P.、Crisp, Geoffrey T.、Gable, Robert W.、'et al.