prepared by reacting pyrazolines with activated alkynes under neat conditions without a catalyst. The products were formed via unexpected ring opening of pyrazolines with the elimination of styrene/ethylene. These types of transformations are unknown and the products formed were confirmed using their spectral/analytical data. In addition, the structures of compounds 5e and 5n were confirmed by single-crystal
1 H -Pyrazole-4,5-dicarboxylates 和 chromenopyrazole carboxylates 是通过在没有催化剂的纯净条件下使吡唑啉与活化的炔烃反应制备的。产物是通过吡唑啉的意外开环和苯乙烯/乙烯的消除而形成的。这些类型的转化是未知的,并且使用它们的光谱/分析数据确认了所形成的产物。此外,化合物5e和5n的结构通过单晶X射线分析证实。进行了对照实验以支持所提出的反应机理。
Palladium-Catalyzed Oxidative Rearrangement of Tertiary Allylic Alcohols to Enones with Oxygen in Aqueous Solvent
作者:Jingjie Li、Ceheng Tan、Jianxian Gong、Zhen Yang
DOI:10.1021/ol502578h
日期:2014.10.17
A one-pot procedure for Pd(TFA)2-catalyzed 1,3-isomerization of tertiary allylic alcohols to secondary allylic alcohols followed by a Pd(TFA)2/neocuproine-catalyzed oxidative reaction to β-disubstituted-α,β-unsaturated kenones was developed.
An advanced and novel one-pot synthetic method for diverse benzo[c]chromen-6-ones by transition-metal free mild base-promoted domino reactions of substituted 2-hydroxychalcones with β-ketoesters and its application to polysubstituted terphenyls
作者:Tej Narayan Poudel、Yong Rok Lee
DOI:10.1039/c3ob41800f
日期:——
one-pot syntheses of a variety of benzo[c]chromen-6-one derivatives were accomplished using Cs2CO3-promoted reactions between substituted 2-hydroxychalcones and β-ketoesters. These reactions involved domino Michael addition/intramolecular aldol/oxidative aromatization/lactonization and provided a rapid synthetic route for the production of biologically interesting novel benzo[c]chromen-6-one molecules bearing
利用取代的2-羟基查耳酮和β-酮酸酯之间的Cs 2 CO 3促进反应,可以完成新颖且有效的一锅合成各种苯并[ c ] chromen-6-一衍生物的反应。这些反应涉及多米诺骨牌迈克尔加成/分子内羟醛/氧化芳构化/内酯化,并提供了快速的合成路线,用于生产生物学上令人关注的新型苯并[ c ] chromen-6-分子,该分子在苯环上带有多个不同的取代基。作为该方法的一种应用,几种合成的苯并[ c ] chromen-6-ones被转化为高度官能化的新型三联苯。
An unexpected multi-component one-pot cascade reaction to access furanobenzodihydropyran-fused polycyclic heterocycles
作者:Jiaomei Guo、Hongjie Miao、Yang Zhao、Xuguan Bai、Yanshuo Zhu、Qilin Wang、Zhanwei Bu
DOI:10.1039/c9cc02170a
日期:——
es has been developed to afford an array of new furanobenzopyran-fused polycyclic compounds with complex molecular architectures. This reaction not only establishes a new reaction mode of ortho-hydroxychalcones but also provides an expedient and convenient synthetic strategy to access complex furanobenzopyran-fused heterocycles.