Synthetic Studies on Lycopodium Alkaloid, Magellanine: Stereoselective Construction of Functionallized Angular Tricyclic Skeletons by Intramolecular Pauson–Khand Reaction
Synthetic Studies on Lycopodium Alkaloid, Magellanine: Stereoselective Construction of Functionallized Angular Tricyclic Skeletons by Intramolecular Pauson–Khand Reaction
Synthesis and Comparative Antibacterial Activity of Verdamicin C2 and C2a. A New Oxidation of Primary Allylic Azides in Dihydro[2<i>H</i>]pyrans
作者:Stephen Hanessian、Janek Szychowski、J. Pablo Maianti
DOI:10.1021/ol802421d
日期:2009.1.15
A synthesis of verdamicin C2 and its congener C2a has been accomplished from sisomicin relying on a novel oxidative transformation of an allylic azide to the corresponding α,β-unsaturated aldehyde, and its stereocontrolled elaboration into the intended 5′ side chain of verdamicin C2 and C2a. In vitro antibacterial testing shows that both C6′ epimers in verdamicin C2 and C2a are equally active against
威索霉素C2及其同类物C2a的合成已由sisomicin依赖于烯丙基叠氮化物向相应的α,β-不饱和醛的新型氧化转化以及其立体控制的精制成维达霉素C2和C2a的预期5'侧链。体外抗菌测试表明,维达霉素C2和C2a中的C6'差向异构体均对多种细菌菌株具有同等活性。2-取代的二氢[2 H ]吡喃的烯丙基伯叠氮化物,醚和酯与SeO 2的氧化直接导致相应的醛。
Transition-Metal-Free Carbofluorination of TBS-Protected Nitrogen-Containing Cyclic Enynols: Synthesis of Fluorinated Azabicycles
作者:Ming-Chang P. Yeh、Chia-Jung Liang、Tzu-Lin Huang、Hsiao-Ju Hsu、Yu-Shuo Tsau
DOI:10.1021/jo400634c
日期:2013.6.7
The synthesis of fluorinated azabicycles from tert-butyldimethylsilyl-protected N-containing cyclic enynols using inexpensive BF3·OEt2 is described. In this reaction, BF3 reacts as both the Lewis acid and the fluoride source for cyclization/fluorination of the TBS-protected cyclic N-containing enynols. The method provides an easy access to fluorinated azabicycles where a new C(sp2)–F bond and a new
Synthetic Studies on Lycopodium Alkaloid, Magellanine: Stereoselective Construction of Functionallized Angular Tricyclic Skeletons by Intramolecular Pauson–Khand Reaction
作者:Miyuki Ishizaki、Yuka Niimi、Osamu Hoshino
DOI:10.1246/cl.2001.546
日期:2001.6
Angular tricyclic compounds as intermediates for total synthesis of magellanine were synthesized by stereoselective Ireland–Claisen rearrangement and intramolecular Pauson–Khand reaction of exo-methylenecyclohexylalkynes. Interestingly, remarkably different reactivity was observed in the Pauson–Khand reaction of cis- and trans-disubstituted exo-methylenecyclohexylalkynes.
<i>O</i><sup>2</sup>-(6-Oxocyclohex-1-en-1-yl)methyl diazen-1-ium-1,2-diolates: a new class of nitric oxide donors activatable by GSH/GSTπ with both anti-proliferative and anti-metastatic activities against melanoma