Rhodium(III)-Catalyzed Cascade Cyclization/Electrophilic Amidation for the Synthesis of 3-Amidoindoles and 3-Amidofurans
作者:Zhiyong Hu、Xiaofeng Tong、Guixia Liu
DOI:10.1021/acs.orglett.6b00689
日期:2016.5.6
A rhodium(III)-catalyzed cascade cyclization/electrophilic amidation using N-pivaloyloxylamides as the electrophilic nitrogen source has been developed. This protocol provides an efficient route for the synthesis of 3-amidoindoles and 3-amidofurans under mild conditions with good functional group tolerance. The synthetic utility of this reaction has been demonstrated through the derivatization of the
Hg(II)-Mediated Intramolecular Cyclization Reaction in Aqueous Media and Its Application as Hg(II) Selective Indicator
作者:Ananta Kumar Atta、Seul-Bi Kim、Jungseok Heo、Dong-Gyu Cho
DOI:10.1021/ol4000873
日期:2013.3.1
The Hg(II)-specific intramolecularcyclizationreaction of ethynyl phenols was carried out for the first time in semiaqueous media at ambient temperature. The reaction unit (ethynyl phenol) was coupled with a malononitrile derivative (signal unit), which afforded the chromogenic Hg(II) indicator 7. The reaction of the chromogenic Hg(II) indicator 7 was further optimized in DMSO/water (3:7, v/v) (10
乙炔基酚的Hg(II)特异性分子内环化反应是在环境温度下首次在半水介质中进行的。将反应单元(乙炔基苯酚)与丙二腈衍生物(信号单元)偶联,得到发色的Hg(II)指示剂7。在DMSO /水(3:7,v / v)(10 mM PBS缓冲液,pH = 7.0)中进一步优化了生色Hg(II)指示剂7的反应。在Hg(II)存在下,化合物7显示出从蓝色到浅黄色的颜色变化。
Fluoride indicator that functions in mixed aqueous media: hydrogen bonding effects
作者:Ananta Kumar Atta、In-Ho Ahn、Ah-Young Hong、Jungseok Heo、Chan Kyung Kim、Dong-Gyu Cho
DOI:10.1016/j.tetlet.2011.11.099
日期:2012.2
A urea-based fluoride anion indicator, 3, that functions in mixed aqueous media is reported. Under these conditions, indicator 3 and the two control systems 1 and 2 are colorless. Addition of fluoride anions produces an easy-to-visualize colorimetric response (colorless to yellow) in the case of 3, but not 1 or 2 as the result of anion-induced Si–O bond cleavage. Most of the colorimetric response is
Chemistry of aminophenols. Part 3: First synthesis of nitrobenzo[b]furans via a coupling–cyclization approach
作者:Wei-Min Dai、Kwong Wah Lai
DOI:10.1016/s0040-4039(02)02333-x
日期:2002.12
The first synthesis of 4-, 5-, and 6-nitrobenzo[b]furans has been achieved via the Sonogashira cross-coupling reaction of 2-iodonitrophenol acetates prepared from commercially available and inexpensive 2-aminonitrophenols. The obtained 2-alkynylnitrophenol acetates were subjected to a KOtBu-promoted cyclization at room temperature to form nitrobenzo[b]furans. Examples of the synthesis of other substituted
通过由市售和廉价的2-氨基硝基苯酚制备的2-碘硝基苯酚乙酸酯的Sonogashira交叉偶联反应已经实现了4-,5-和6-硝基苯并[ b ]呋喃的首次合成。将获得的2-炔基硝基苯酚乙酸酯在室温下进行KO t Bu促进的环化反应以形成硝基苯并[ b ]呋喃。给出了其他取代苯并[ b ]呋喃的合成和一锅偶联-环化的例子。
Efficient Syntheses of Diverse, Medicinally Relevant Targets Planned by Computer and Executed in the Laboratory
作者:Tomasz Klucznik、Barbara Mikulak-Klucznik、Michael P. McCormack、Heather Lima、Sara Szymkuć、Manishabrata Bhowmick、Karol Molga、Yubai Zhou、Lindsey Rickershauser、Ewa P. Gajewska、Alexei Toutchkine、Piotr Dittwald、Michał P. Startek、Gregory J. Kirkovits、Rafał Roszak、Ariel Adamski、Bianka Sieredzińska、Milan Mrksich、Sarah L.J. Trice、Bartosz A. Grzybowski
DOI:10.1016/j.chempr.2018.02.002
日期:2018.3
The Chematica program was used to autonomously design synthetic pathways to eight structurally diverse targets, including seven commercially valuable bioactive substances and one natural product. All of these computer-planned routes were successfully executed in the laboratory and offer significant yield improvements and cost savings over previous approaches, provide alternatives to patented routes, or produce targets that were not synthesized previously.