Sonogashira偶联,Pd(II)催化的羰基环化和苯并呋喃还原(Mg,MeOH,NH 4 Cl)的序列为反式-2-芳基-2,3-二氢苯并[ b ]呋喃提供了一种收敛的模块化合成途径。-3-羧酸盐,是许多具有生物活性的天然产物的结构特征。这种多用途的策略适用于抗HIV天然产物(+)-紫精酸的正式全合成。
A concise approach for the synthesis of 3-iodoindoles and 3-iodobenzo[b]furans via Ph3P-catalyzed iodocyclization
作者:Yin-Long Li、Jian Li、Sheng-Nan Yu、Ji-Bo Wang、Yan-Min Yu、Jun Deng
DOI:10.1016/j.tet.2015.09.005
日期:2015.10
A variety of 3-iodoindole and 3-iodobenzo[b]furan derivatives were conveniently prepared from the corresponding 2-alkynylanilines and 2-alkynylphenols through Ph3P-catalyzed iodocyclization in the presence of N-iodosuccinimide (NIS). This protocol provides a rapid access to 3-iodoindoles and 3-iodobenzo[b]furans in good to excellent yields under mild conditions.
Metal-Free Radical Annulation of Oxygen-Containing 1,7-Enynes: Configuration-Selective Synthesis of (<i>E</i>)-3-((Arylsulfonyl)methyl)-4-Substituted Arylidenechromene Derivatives
作者:Kaimin Mao、Mouwang Bian、Lei Dai、Jinghang Zhang、Qiuyu Yu、Chang Wang、Liangce Rong
DOI:10.1021/acs.orglett.0c03946
日期:2021.1.1
A novel strategy for the synthesis of (E)-3-((arylsulfonyl)methyl)-4-substituted benzylidenechromene derivatives via a metal-free radical annulation reaction of oxygen-containing 1,7-enynes with thiosulfonates has been developed. The reaction shows broad substrate scope, wide functional group tolerance, and moderate to excellent yields. Moreover, thiosulfonates were well driven to achieve the bifunctionalization
Iridium(<scp>i</scp>)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylic acids
作者:Linwei Zeng、Renjie Chen、Chen Zhang、Hujun Xie、Sunliang Cui
DOI:10.1039/c9cc09984k
日期:——
An iridium(i)-catalyzed hydration/esterification of 2-alkynylphenols and carboxylicacids is described. Various 2-alkynylphenols and carboxylicacids could be used in this process to furnish aromatic ortho-acyloxyketones via a regio- and stereo-selective addition reaction followed by intramolecular rearrangement. This protocol features mild reaction conditions and broad substrate scope. Further transformations
Metal-free difunctionalization of alkynes to access tetrasubstituted olefins through spontaneous selenosulfonylation of vinylidene <i>ortho</i>-quinone methide (VQM)
difunctionalization of alkynes to access tetrasubstituted olefins through spontaneous selenosulfonylation of vinylidene ortho-quinone methide (VQM) was described herein. The reaction was conducted under mild conditions without any catalysts or additives. Preliminary mechanism studies revealed that the formation of VQM was the key for this alkyne di-functionalization reaction. The reaction could be applied
本文描述了炔烃的无金属双官能化,以通过亚乙烯基邻甲基醌(VQM)的自发硒代磺酰基化来获得四取代的烯烃。反应在温和条件下进行,没有任何催化剂或添加剂。初步的机理研究表明,VQM的形成是这种炔烃双官能化反应的关键。该反应可用于轴向手性苯乙烯的对映选择性不对称合成。此外,硒代磺酰化加合物可以转化为有用的萘[2,1- b ]呋喃和苯并呋喃支架。
Efficient microwave-assisted one-pot three-component synthesis of 2,3-disubstituted benzofurans under Sonogashira conditions
作者:Nataliya A. Markina、Yu Chen、Richard C. Larock
DOI:10.1016/j.tet.2013.02.003
日期:2013.4
efficient one-pot method for the synthesis of 2,3-disubstituted benzo[b]furans from commercially available 2-iodophenols, terminal acetylenes and aryl iodides has been developed utilizing Sonogashira reaction conditions. After an initial Sonogashira coupling of the 2-iodophenol with the terminal alkyne, cyclization involving the aryl iodide provides the 2,3-disubstituted benzo[b]furan in good to excellent