Chemoselective CC Bond Cleavage of Epoxide Motifs: Gold(I)-Catalyzed Diastereoselective [4+3] Cycloadditions of 1-(1-Alkynyl)oxiranyl Ketones and Nitrones
作者:Tao Wang、Junliang Zhang
DOI:10.1002/chem.201002395
日期:2011.1.3
Cutting carbon! A novel facile strategy for the CCbondcleavage of oxiranylketones has been developed. Carbophilic gold(I) activation of the alkyne side chain mediates a heterocyclization and subsequent CCbondcleavage (see scheme).
DBU-catalyzed tandem additions of electron-deficient 1,3-conjugated enynes with 2-aminomalonates: a facile access to highly substituted 2-pyrrolines
作者:Xiuzhao Yu、Guanghua Zhou、Junliang Zhang
DOI:10.1039/c2cc30840a
日期:——
An efficient, metal free approach to highly substituted 2-pyrrolines by DBU-catalyzed tandem additions (a formal [3+2] cycloaddition) of electron-deficient 1,3-conjugated enynes and 2-aminomalonates under mild conditions was developed.
Gold-Catalyzed Cascade Reaction of Yne-Enones with Iminooxindoles, Access to 3,2′-Pyrrolidinyl-Spirooxindole Derivatives
作者:Yijun Liu、Xiaojiang Shen、Pengyan Zhu、Jiang-miao Hu、Xuanjun Wang、Shulin Ge
DOI:10.1021/acs.orglett.4c01395
日期:2024.6.7
Herein, a gold-catalyzedcascade reaction of yne-enones with iminooxindoles has been developed through a cascade cycloisomerization/(3 + 2) annulation process. This approach provides a straightforward and efficient route for the synthesis of functionalized 3,2′-pyrrolidinyl-spirooxindoles in high reactivity and broad substrate scope with excellent cis-selectivity. Moreover, the subsequent functionalization
Phosphine-Mediated Regio- and Stereoselective Hydrocarboxylation of Enynes
作者:Wenbo Li、Junliang Zhang
DOI:10.1021/ol4031556
日期:2014.1.3
A phosphine-mediated regio- and stereoselective addition reaction of diverse nucleophiles to yne-enones leading to polysubstituted 1,3-diene scaffolds in moderate to good yields has been reported.
A Class of Chiral‐Bridged Biphenyl Monophosphine Ligands with Benzofuran Moiety and The Application in Diastereo‐ and Enantioselective Au(I)‐Catalyzed Cycloaddition
A class of novel chiral‐bridged biphenyl monophosphine ligands with a benzofuran moiety (He‐phos) has been successfully synthesized and reported. These ligands exhibited good performance in the gold‐catalyzed enantioselective cycloaddition reaction of 2‐(1‐alkynyl)‐2‐en‐1‐ones with nitrones, resulting in the successful preparation of a series of polyaryl‐substituted heterocyclic compounds with high enantioselectivities (up to 99% yield, 98% ee). The wide substrate adaptability (53 examples) and mild reaction conditions demonstrate the practicability of He‐phos in this reaction.