Advancements in Gold-Catalyzed Cascade Reactions to Access Carbocycles and Heterocycles: An Overview

This review summarizes recent developments (from 2006 to 2022) in numerous important and efficient carbo- and heterocycle generations using gold-catalyzed cascade protocols. Herein, methodologies involve selectivity, cost-effectiveness, and ease of product formation being controlled by the ligand as well as the counter anion, catalyst, substrate, and reaction conditions. Gold-catalyzed cascade reactions covered different strategies through the compilation of various approaches such as cyclization, hydroarylation, intermolecular and intramolecular cascade reactions, etc. This entitled reaction is also useful for the synthesis of spiro, fused, bridged carbo- and heterocycles.     

2,5,7,9—四硝基—2,5,7,9—四氮杂双环[4.3.0]壬—8—酮的合成

以乙二胺、乙二醛和脲为原料，通过曼尼希反应，合成了２，５，７，９－四氮杂双环［４．３．０］壬－８－酮盐酸盐（Ｉ）。化合物Ｉ在硝酸－乙酸酐体系中硝化，制得了标题化合物。     

2，5，7，9－四硝基－2，5，7，9－四氮杂双环［4．3．0］壬－8－酮的合成

以乙二胺、乙二醛和脲为原料，通过曼尼希反应，合成了２，５，７，９－四氮杂双环［４．３，０］壬－８－酮盐酸盐（Ⅰ）．化合物Ⅰ在硝酸－乙酸酐体系中硝化，制得了标题化合物。