PdCl<sub>2</sub>-Catalyzed Two-Component Cross-Coupling Cyclization of 2,3-Allenoic Acids with 2,3-Allenols. An Efficient Synthesis of 4-(1‘,3‘-Dien-2‘-yl)-2(5<i>H</i>)-furanone Derivatives
作者:Shengming Ma、Zhenhua Gu
DOI:10.1021/ja0500815
日期:2005.5.1
Cross-coupling cyclization reaction between 2,3-allenoic acids 1 and 2,3-allenols 2, in which two allenes functioned differently, was realized to afford 4-(1',3'-dien-2'-yl)-2(5H)-furanone derivatives3. The reaction may proceed via an oxypalladation, insertion, and beta-hydroxide elimination process. A high E-stereoselectivity of the new formed C=C double bond was observed.
Efficient Assembly of Chromone Skeleton from 2,3-Allenoic Acids and Benzynes
作者:Guobi Chai、Youai Qiu、Chunling Fu、Shengming Ma
DOI:10.1021/ol202076c
日期:2011.10.7
Chromone derivatives were synthesized from 2,3-allenoicacids and benzynes in moderate to excellent yields under mild conditions. Instead of the cyclic conjugate addition of the intermediate A formed by the nucleophilic addition of allenoic acid with benzyne, this intermediate undergoes 1,2-addition with the carbonyl group, which was followed by the ring opening, conjugate addition, and protonolysis
3-allenoic acids with AgSCF3 in the presence of (NH4)2S2O8 and catalytic copper salt was investigated. A series of 4-aryl-2,3-allenoic acids underwent radical trifluoromethylthiolation/intramolecular cyclization to afford β-trifluoromethylthiolated butenolides, which were conveniently transformed into trifluoromethylthiolated furan derivatives. In contrast, 2-monosubstituted 2,3-allenoic acids were converted
研究了在(NH 4)2 S 2 O 8和催化铜盐存在下,AgSCF 3对2,3-烯丙基酸的氧化三氟甲基硫醇化反应。一系列的4-芳基-2,3-烯丙酸经过自由基三氟甲基硫醇化/分子内环化反应,得到β-三氟甲基硫醇化的丁烯化物,将其方便地转化为三氟甲基硫醇化的呋喃衍生物。相反,在相似的反应条件下,将2-单取代的2,3-烯丙酸转化成相应的3,4-双(三氟甲硫基)丁-2-烯酸。
Ugi/Himbert Arene/Allene Diels–Alder Cycloaddition to Synthesize Strained Polycyclic Skeleton
作者:Guangsheng Cheng、Xiang He、Lumin Tian、Jiawen Chen、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.joc.5b01724
日期:2015.11.6
The present work disclosed an efficient multicomponent reaction of isocyanide, allenic acid, aldehyde (ketone), and aniline. This protocol undergoes Ugi reaction followed by an intramolecular arene/allene Diels–Alder sequence, thus providing a rapidaccess to synthesize strained polycyclicskeletons.
Rh-Catalyzed cyclization of 2,3-allenoic acids in the presence of 2,3-allenols
作者:Junjie Fan、Chunling Fu、Xiaoyan Wu、Shengming Ma
DOI:10.1039/d1cc04367f
日期:——
Herein we report a [Cp*RhCl2]2-catalyzed coupling cyclization of two different classes of allenes with 2,3-allenoic acids affording 2(5H)-furanone skeletons of products and 2,3-allenols forming a conjugated (E)-enal or enone functionality to the β-position of the 2(5H)-furanones. These products are important building blocks for the syntheses of potentially bioactive compounds. The reaction proceeded
在本文中,我们报告了 [Cp*RhCl 2 ] 2催化的两种不同类型的丙二烯与 2,3-丙烯酸的偶联环化反应,提供 2(5 H )-呋喃酮骨架的产物和 2,3-丙二烯醇形成共轭 ( E )-烯醛或烯酮官能团连接到 2(5 H )-呋喃酮的 β-位。这些产品是合成潜在生物活性化合物的重要组成部分。该反应通过由铑携带的核金属化、插入和立体定义的 1,4- H传递进行。