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.
A highly efficient and stereoselective method for the synthesis of (1Z)‐1,2‐dihalo‐3‐vinyl‐1,3‐dienes featuring palladium‐catalyzed coupling of haloalkynes and 2,3‐butadienyl acetates was developed. The resulting products were smoothly converted into cis‐1,2‐dihalostyrene derivatives using the Diels–Alder/aromatization sequence.
Au-Catalyzed tandem intermolecular hydroalkoxylation/Claisen rearrangement between allylic alcohols and chloroalkynes
作者:Congrong Liu、Jin Xu、Lianghui Ding、Haiyun Zhang、Yunbo Xue、Fulai Yang
DOI:10.1039/c9ob00151d
日期:——
An efficient protocol for the synthesis of γ,δ-unsaturated α-chloroketones has been developed via Au-catalyzed tandem intermolecular hydroalkoxylation/Claisen rearrangement. In the presence of 1 mol% JohnPhosAuCl and 1 mol% NaBArF, a broad range of allylic alcohols smoothly underwent the tandem intermolecular hydroalkoxylation/Claisen rearrangement with aromatic, vinylic or aliphatic chloroalkynes
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.
Au-Catalyzed intermolecular (3 + 2 + 1) and (5 + 2) cycloaddition for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines
作者:Congrong Liu、Jin Xu、Gongde Wu
DOI:10.1039/d0cc05059h
日期:——
present interesting potential as motifs for the incorporation of biologically relevant molecules, agrochemicals and materials. In this study, two efficient intermolecular (3 + 2 + 1) and (5 + 2) cycloadditions for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines are achieved with gold catalysis.