Palladium-catalyzed intermolecular tandem cyclization reaction: a highly regioselective synthesis of functionalized 3H-spiro[isobenzofuran-1,3′-isochroman] scaffolds
functionalized 3H-spiro[isobenzofuran-1,3′-isochroman] scaffolds using a novel palladium-catalyzed tandem cyclization reaction is explored. During the reaction process, C–O, C–C and C–O bonds are sequentially formed in one pot viadecarboxylative allenylpalladium formation, nucleophilic attack, arylpalladium addition and intramolecular nucleophilic attack.
Potential antitumor agents. 61. Structure-activity relationships for in vivo colon 38 activity among disubstituted 9-oxo-9H-xanthene-4-acetic acids
作者:Gordon W. Rewcastle、Graham J. Atwell、Li Zhuang、Bruce C. Baguley、William A. Denny
DOI:10.1021/jm00105a034
日期:1991.1
Analogues of 9-oxo-9H-xanthene-4-acetic acid (XAA) bearing small, lipophilic 5-substituents are among the most dose-potent compounds yet reported with the capability of causing hemorrhagic necrosis of implanted colon 38 tumors in mice. To further extend structure-activity relationships among this class of compound, a series of XAA derivatives bearing two small lipophilic groups at various positions
Palladium-Catalyzed Carbonylative Annulation Reactions Using Aryl Formate as a CO Source: Synthesis of 2-Substituted Indene-1,3(2<i>H</i>)-dione Derivatives
作者:Ying Zhang、Jing-Lei Chen、Zhen-Bang Chen、Yong-Ming Zhu、Shun-Jun Ji
DOI:10.1021/acs.joc.5b01758
日期:2015.11.6
An efficient synthesis of 2-substituted indene-1,3(2H)-diones from stable and readily available 1-(2-halophenyl)-1,3-diones by employing phenyl formate as a CO source has been developed. The reaction occurred via palladium-catalyzed intramolecular carbonylative annulation using K3PO4 as a base and DMSO as a solvent at 95 °C. In this protocol, the reaction showed a broad substrate scope with good to
已经开发了通过使用甲酸苯酯作为CO源从稳定且容易获得的1-(2-卤代苯基)-1,3-二酮有效合成2-取代的茚-1,3(2 H)-二酮的方法。该反应通过在95°C下使用K 3 PO 4为碱和DMSO作为溶剂的钯催化的分子内羰基环化反应进行。在该方案中,反应显示出广泛的底物范围,具有良好或优异的产率。
Copper-Catalyzed Oxyalkynylation of C–S Bonds in Thiiranes and Thiethanes with Hypervalent Iodine Reagents
作者:Julien Borrel、Guillaume Pisella、Jerome Waser
DOI:10.1021/acs.orglett.9b04157
日期:2020.1.17
We report the oxyalkynylation of thiiranes and thietanes using ethynylbenziodoxolonereagents (EBXs) to readily access functionalized building blocks bearing an alkynyl, a benzoate, and an iodide group. The reaction proceeds with high atom efficiency most likely through an alkynyl-episulfonium intermediate. The transformation is copper-catalyzed and compatible with a large array of thiiranes and thietanes
Super acid catalysed sequential hydrolysis/cycloisomerization of o-(acetylenic)benzamides under microwave condition: Synthesis, antinociceptive and antiinflammatory activity of substituted isocoumarins
作者:CHANDRASEKARAN PRAVEEN、P DHEENKUMAR、P T PERUMAL
DOI:10.1007/s12039-012-0325-2
日期:2013.1
Synthesis of isocoumarins and related compounds via triflic acid promoted hydrolysis/cyclization sequence of 2-(alkynyl)benzamides under microwave condition was achieved. The substrate scope of the reaction was broad to include not only aromatic but also polyaromatic and heteroaromatic motifs, thus highlighting the significance of this methodology. One-pot operation, short reaction time, good chemical