Au-Catalyzed Stereoselective Ritter Reaction of Haloalkynes with Nitriles for (<i>Z</i>
)-<i>β</i>
-Halogenated Enamides
作者:Congrong Liu、Fulai Yang
DOI:10.1002/ejoc.201901318
日期:2019.10.31
An efficient and stereoselective protocol has been developed for the synthesis (Z)‐β‐Halogenated enamide via gold catalyzed Ritter reaction. In the presence of 2 mol‐% BrettPhosAuCl and 2 mol‐% AgNTf2, a broad range of nitriles smoothly underwent Ritter reaction with aromatic, vinylic or aliphatic haloalkynes to give structurally diverse (Z)‐β‐Halogenated enamides in excellent to good yields.
Benign catalysis with zinc: atom-economical and divergent synthesis of nitrogen heterocycles by formal [3 + 2] annulation of isoxazoles with ynol ethers
作者:Xin-Qi Zhu、Han Yuan、Qing Sun、Bo Zhou、Xiao-Qin Han、Zhi-Xin Zhang、Xin Lu、Long-Wu Ye
DOI:10.1039/c8gc02051e
日期:——
zinc-catalyzed formal [3 + 2] annulation of isoxazoles with ynol ethers under exceptionally mild reaction conditions, leading to the atom-economical and divergent synthesis of 2-alkoxyl 1H-pyrroles and 3H-pyrroles, respectively. Importantly, this zinc-catalyzed protocol demonstrates the dramatically divergent reactivity from the relevant platinum catalysis, where the formal [4 + 2] annulation of isoxazoles with
Au
<sup>I</sup>
‐Catalyzed Haloalkynylation of Alkenes
作者:Pedro D. García‐Fernández、Cristina Izquierdo、Javier Iglesias‐Sigüenza、Elena Díez、Rosario Fernández、José M. Lassaletta
DOI:10.1002/chem.201905078
日期:2020.1.13
The formalinsertion of alkenes into aromatic chloro- and bromoalkynes takes place under cationic gold catalysis. This haloalkynylation reaction can be performed with cyclic, gem-disubstituted and monosubstituted alkenes, using BINAP, triazolo[4,3-b]isoquinolin-3-ylidene ligands or SPhos, respectively. The products were isolated in moderate to excellent yields and with complete diastereo- and regioselectivity;
A subject of the present application is novel imidazolidine-2,4-dione derivatives of formula (I). These products have an anti-proliferative activity. They are particularly useful for treating the pathological states and the diseases linked to an abnormal cell proliferation such as cancers. The invention also relates to the pharmaceutical compositions containing said products and their use for the preparation of a medicament.
Pd-catalyzed coupling of haloalkynes with allyl acetate has been reported, providing a convenient method for the stereoselective synthesis of (Z)-β-haloenol acetates in good yields. The synthetic utility of this method is demonstrated by the formation of functionalized enol acetates via the Suzuki–Miyaura or Sonogashira coupling of the resulting (Z)-β-haloenol acetate products.