Simple protocol for enhanced (E)-selectivity in Julia–Kocienski reaction
摘要:
A short and efficient Julia-Kocienski olefination protocol, based upon the use of chelating agents (18-crown-6 or TDA-1 for K(+); 12-crown-4 or HMPA for Li(+)), was developed. This protocol enhances the (E)selectivity of the reaction and the desired olefins are obtained generally with >10:1 (E/Z)-selectivity. (C) 2011 Elsevier Ltd. All rights reserved.
The Discovery and Structure‐Activity Evaluation of (+)‐Floyocidin B and Synthetic Analogs
作者:Yolanda Kleiner、Christoph Pöverlein、Jannike Klädtke、Michael Kurz、Henrik F. König、Jonathan Becker、Sanja Mihajlovic、Florian Zubeil、Michael Marner、Andreas Vilcinskas、Till F. Schäberle、Peter Hammann、Sören M. M. Schuler、Armin Bauer
DOI:10.1002/cmdc.202100644
日期:2022.3.18
hit series: Our search for new antitubercular natural products resulted in the discovery of the novel epoxyquinone (+)-floyocidin B, which structure was unambiguously determined by total synthesis. Biological and physicochemical profiling of (+)-floyocidin B and synthetic analogs revealed first structure-activity relationships and set the basis for further optimization and development of this novel
抗结核病系列:我们对新的抗结核天然产品的研究导致发现了新型环氧醌 (+)-氟西汀 B,其结构由全合成明确确定。(+)-floyocidin B 和合成类似物的生物和物理化学分析揭示了第一个结构-活性关系,并为进一步优化和开发这种新型抗结核支架奠定了基础。
Synthesis of the Cyanobacterial Antibiotics Anaephenes A and B
作者:David L. Kukla、Juan Canchola、Jonathan J. Mills
DOI:10.1021/acs.jnatprod.0c00279
日期:2020.6.26
The first syntheses of the antibacterial natural products anaephenes A (1) and B (2) are reported. Both natural products were synthesized in five linear steps from commercially available tert-butyl(3-iodophenoxy)dimethylsilane. Key steps for the synthesis included a Sonogashira cross-coupling and a Julia-Kocienski olefination to selectively construct the E-alkene present in the natural products. This
抗菌天然产物厌氧苯甲醚 A ( 1 ) 和 B ( 2 )的首次合成已被报道。这两种天然产物都是由市售的叔丁基(3-碘苯氧基)二甲基硅烷在五个线性步骤中合成的。合成的关键步骤包括 Sonogashira 交叉偶联和 Julia-Kocienski 烯化,以选择性地构建天然产物中存在的E-烯烃。这种合成路线可以确认厌氧苯甲醚 A ( 1 ) 和 B ( 2 )的特性和抗菌活性。此外,这些化合物显示出对耐甲氧西林金黄色葡萄球菌的抗菌活性 (MRSA) 的 MIC 值分别为 16 和 8 μg/mL。
Stereoselective Synthesis of Conjugated Polyenes Based on Tethered Olefin Metathesis and Carbonyl Olefination: Application to the Total Synthesis of (+)-Bretonin B
作者:Kajsa Lood、Bernd Schmidt
DOI:10.1021/acs.joc.0c00446
日期:2020.4.3
The combination of a highly stereoselective tethered olefinmetathesis reaction and a Julia–Kocienski olefination is presented as a strategy for the synthesis of conjugated polyenes with at least one Z-configured C═C bond. The strategy is exemplified by the synthesis of the marine natural product (+)-bretonin B.
N,N-SUBSTITUTED 3-AMINOPYRROLIDINE COMPOUNDS USEFUL AS MONOAMINES REUPTAKE INHIBITORS
申请人:KURIMURA Muneaki
公开号:US20140288065A1
公开(公告)日:2014-09-25
The present invention provides a pyrrolidine compound of General Formula (1)
or a salt thereof, wherein R
101
and R
102
are each independently a phenyl group or a pyridyl group, the phenyl group or the pyridyl group may have one or more substituents selected from halogen atoms and lower alkyl groups optionally substituted with one or more halogen atoms, etc. The pyrrolidine compound or a salt thereof of the present invention is usable to produce a pharmaceutical preparation having a wider therapeutic spectrum and being capable of exhibiting sufficient therapeutic effects after short-term administration.
S-alkylated derivatives of 1-phenyl tetrazole-5-thione were synthesized by Michaeladdition in organic salt media TBAB (Tetrabutylammonium bromide) using inorganic base K2CO3 under solvent-free conditions. The new and conveniently synthesized products showed unusual regioselectivity during the reaction. S-Michael adducts via reactionbetween 1-phenyl tetrazole-5-thione and acrylic esters as well as acrylonitrile
在这项工作中,在无溶剂条件下,使用无机碱K 2 CO 3在有机盐介质TBAB(四丁基溴化铵)中通过迈克尔加成合成了一系列新型1-苯基四唑-5-硫酮的N和S-烷基化衍生物。新的且方便合成的产物在反应过程中表现出不同寻常的区域选择性。1-苯基四唑-5-硫酮与丙烯酸酯以及丙烯腈在室温下反应得到S-迈克尔加合物,在70℃下得到N-迈克尔加合物。两个反应均在 24 小时内发生。令人惊讶的是,由于空间效应,使用富马酸酯作为迈克尔受体在100℃下进行了S N 2 反应。产物结构均经1H确认13 C NMR 谱和目标化合物收率良好至优异。