作者:Yang Liu、Mikaël Le Roch、Alessia Mori、Alexandre Pradal、Giovanni Poli、Julie Oble
DOI:10.1002/ejoc.202300710
日期:2023.10.9
Pd-catalyzed [3+2] annulations go dehydrogenative: a new protocol enables the Pd(II)-catalyzed [3+2] annulation between resonance-stabilized acetamides (or 3-oxoglutarates) and β,γ-unsaturated cyclic carbonyl derivatives. This dehydrogenative strategy represents a more atom- and step- economical version than the corresponding Pd(0)-catalyzed redox-neutral couplings previously studied by our group,
Highly controlling selectivity of copper(I)-catalyzed azide/alkyne cycloaddition (CuAAC) between sulfonyl azids and normal alkynes or propynoates
作者:Yantao Liu、Xinyan Wang、Jimin Xu、Qun Zhang、Yi Zhao、Yuefei Hu
DOI:10.1016/j.tet.2011.06.017
日期:2011.8
In this article, a combination of Cu(OAc)(2).H(2)O/(2)-aminophenol was developed as a highly efficient and controlling catalytic system for sulfonyl azids involved CuAAC. By using this catalytic system, sulfonyl azids reacted with normal alkynes or propynoates to selectively give the ring products or the chain products, respectively, in excellent yields within minutes. HOAc in situ produced in the reaction has been proved to be a super protonation reagent, by which the unstable intermediate 5-cuprated 1,2,3-triazole was protonated efficiently to yield ring-product 1-sulfonyl 1,2,3-trizoles. The control experiments also proved that 2-aminophenol played dual roles as both ligand and reductant, which led to the cheap and chemically stable Cu(OAc)(2)center dot H(2)O being an efficient copper source for our purpose. (C) 2011 Elsevier Ltd. All rights reserved.
作者:Yang Liu、Zhongyi Mao、Alexandre Pradal、Pei-Qiang Huang、Julie Oble、Giovanni Poli
DOI:10.1021/acs.orglett.8b01616
日期:2018.7.6
The synthesis of bi- and tricyclic structures incorporating pyrrolidone rings is disclosed, starting from resonance-stabilized acetamides and cyclic α,β-unsaturated-γ-oxycarbonyl derivatives. This process involves an intermolecular Tsuji–Trost allylation/intramolecular nitrogen 1,4-addition sequence. Crucial for the success of this bis-nucleophile/bis-electrophile [3 + 2] annulation is its well-defined