Enantio- and Diastereoselective Syntheses of 3-Hydroxypiperidines through Iridium-Catalyzed Allylic Substitution
作者:Johannes Hoecker、Georg C. Rudolf、Florian Bächle、Steffen Fleischer、Benjamin D. Lindner、Günter Helmchen
DOI:10.1002/ejoc.201300445
日期:2013.8
Stereoselective syntheses of 3-hydroxypiperidines have been developed. Key intermediates are N-protected allylamines that are prepared by an enantioselective iridium-catalyzedallylic amination. A subsequent catch and release procedure that involves an epoxidation and base-mediated elimination yields δ-lactams that are suitably functionalized to prepare biologically active 3-hydroxypiperidines. In addition
已经开发了 3-羟基哌啶的立体选择性合成。关键中间体是通过对映选择性铱催化的烯丙胺化反应制备的 N 保护的烯丙胺。随后的捕获和释放程序涉及环氧化和碱介导的消除,产生 δ-内酰胺,其被适当地官能化以制备具有生物活性的 3-羟基哌啶。此外,还描述了该方法在脱氧甘露野尻霉素、D-赤型鞘氨醇和对药物化学感兴趣的手性构件的全合成中的应用。
Synthesis and evaluation of the antitumor agent TMC-69-6H and a focused library of analogs
peroxomolybdenum complex [(pyridine)MoO5(HMPA)] to form the hydroxamic acid motif. The flexibility inherent to this route allows for the preparation of a focused library of analogues for biochemical evaluation. The results obtained show that N-hydroxy-2-pyridone derivatives constitute a promising new class of selective phosphatase inhibitors. In contrast to previous reports in the literature, however, TMC-69-6H
作者:Dakhil Z. Al Kremawi、Juma'a R. Al Dulayymi、Mark S. Baird
DOI:10.1016/j.tet.2014.06.089
日期:2014.10
We report the synthesis of single enantiomers of epoxy-mycolic acids containing an alpha-methyl-transalkene or a cis-cyclopropane with structures that match those of major isomers of such molecules present in complex mixtures in Mycobacteria such as Mycobacterium fortuitum or Mycobacterium smegmatis (C) 2014 Elsevier Ltd. All rights reserved.
Toward the synthesis of the hypoxia selective anticancer agent BE-43547 A<sub>2</sub>
作者:Ramagonolla Kranthikumar
DOI:10.1039/d1ob01824h
日期:——
derived from D-glucose. The synthetic strategy involves a Julia–Kocienski olefination to install the lipophilic side chain. An efficient protocol for Z to Eisomerization of olefin was developed using a novel UV flow reactor. In addition, an unprecedented oxygen mediated hydroboration and the Krapcho decarboxylation of β-keto lactone were observed.
已经以高产率实现了 19- epi -BE-43547 A 2手性框架的简短且对映选择性合成。具有挑战性的关键 C15 三级立构中心源自D-葡萄糖。合成策略涉及 Julia-Kocienski 烯化反应以安装亲脂性侧链。使用新型紫外流动反应器开发了一种有效的烯烃Z至E异构化方案。此外,还观察到前所未有的氧介导的硼氢化反应和β-酮内酯的克拉普乔脱羧反应。
A formal synthesis of 3-O-(4-methoxybenzyl)-azidosphingosine by a modified Julia olefination
characteristic trans double bond was accomplished by condensation between tetradecanal and a heterocyclic sulfone derived from diethyl-d-tartrate, following the Kocienski modification of the Juliaolefination.