Synthesis of indenones via palladium-catalyzed annulation of internal alkynes
摘要:
A number of 2,3-disubstituted 1-indenones have been prepared in fair to good yields by treating o-iodo- or o-bromobenzaldehyde with various internal alkynes in the presence of a palladium catalyst. Synthetically, the methodology provides an especially convenient route to stable hindered indenones containing aryl, silyl, and tert-alkyl groups. The reaction is believed to proceed through a palladium-(IV) intermediate, and the regiochemistry of the reaction is controlled sterically.
Carbopalladation of Nitriles: Synthesis of 2,3-Diarylindenones and Polycyclic Aromatic Ketones by the Pd-Catalyzed Annulation of Alkynes and Bicyclic Alkenes by 2-Iodoarenenitriles
作者:Alexandre A. Pletnev、Qingping Tian、Richard C. Larock
DOI:10.1021/jo026178g
日期:2002.12.1
represents one of the first examples of the addition of an organopalladium moiety to the carbon-nitrogentriplebond of a nitrile. The reaction is compatible with a number of functional groups. A reaction mechanism, as well as a model accounting for the electronic effects of substituents on the aromatic ring of the nitrile, is proposed.
Rhodium/Copper-Catalyzed Annulation of Benzimides with Internal Alkynes: Indenone Synthesis through Sequential CH and CN Cleavage
作者:Bi-Jie Li、Hao-Yuan Wang、Qi-Lei Zhu、Zhang-Jie Shi
DOI:10.1002/anie.201200271
日期:2012.4.16
Doubled up: A rhodium(III)/copper(II) system co‐catalyzes the annulation of benzimides with internal alkynes for the synthesis of indenones (see scheme; Cp*=C5Me5). The reaction involves an uncommon nucleophilic addition of a transition‐metal–carbon bond to an imide moiety. This novel reaction provides a facile route to synthesize indenones from readily available benzimides and internal alkynes.
加倍:铑(III)/铜(II)系统共催化苯并酰亚胺与内部炔烃的环化反应,以合成茚满(参见方案; Cp * = C 5 Me 5)。该反应涉及到过渡金属-碳键向酰亚胺部分的不常见亲核加成。该新颖的反应提供了从容易获得的苯甲酰亚胺和内部炔烃合成茚满的简便途径。
Cobalt(<scp>iii</scp>)-catalyzed annulation of esters and alkynes: a facile route to indenones
An efficient protocol for the synthesis of indenones has been developed from the annulation of benzoic esters and internal alkynes by exploiting cobalt catalyst.
通过利用钴催化剂,通过苯甲酸酯和内部炔烃的环化,已经开发出一种有效的合成茚满的方案。
Synthesis of 2,3-disubstituted indenones by cobalt-catalyzed [3+2] annulation of o-methoxycarbonylphenylboronic acid with alkynes
Treatment of alkynes with o-methoxycarbonylphenylboronic acid in the presence of a cobalt catalyst resulted in the corresponding 2,3-disubstituted indenones.
将炔烃与在钴催化剂存在下的o-甲氧羰基苯硼酸反应,得到相应的2,3-二取代的茚酮。
Gold-Catalyzed Ammonium Acetate Assisted Cascade Cyclization of 2-Alkynylarylketones
作者:Maciej E. Domaradzki、Yuhua Long、Zhigang She、Xiaochen Liu、Gan Zhang、Yu Chen
DOI:10.1021/acs.joc.5b01939
日期:2015.11.20
An ammonium acetate assisted gold-catalyzedcascadecyclization reaction of 2-alkynylarylketones is described. Under the reported conditions, a gold-catalyzed intramolecular cyclization of 2-alkynylarylketones takes place through two competing reaction mechanisms—a 5-exo-dig or a 6-endo-dig cyclization—leading to two regioisomeric intermediates: isobenzofuranium or isobenzopyrylium. In the presence