Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
Copper-Catalyzed Decarboxylative Oxyalkylation of Alkynyl Carboxylic Acids: Synthesis of γ-Diketones and γ-Ketonitriles
作者:Yi Li、Jia-Qi Shang、Xiang-Xiang Wang、Wen-Jin Xia、Tao Yang、Yangchun Xin、Ya-Min Li
DOI:10.1021/acs.orglett.9b00520
日期:2019.4.5
A novel copper-catalyzed decarboxylative oxyalkylation of alkynyl carboxylic acids with ketones and alkylnitriles via direct C(sp3)–H bond functionalization to construct new C–C bonds and C–O double bonds was developed. This transformation is featured by wide functionalgroup compatibility and the use of readily available reagents, thus affording a general approach to γ-diketones and γ-ketonitriles
A Novel Ketonitrile Synthesis by Palladium-Catalyzed Carbonylative Coupling Reactions of Amides with Arylboronic Acids
作者:Wen-Peng Mai、Yang Liu、Hong-Dai Sui、Yong-Mei Xiao、Pu Mao、Kui Lu
DOI:10.1002/ejoc.201901396
日期:2019.12.31
A novel, efficient, and simple procedure to synthesize diverse ketonitriles by palladium‐catalyzed Suzuki coupling of amides through N–C cleavage has been developed. This procedure features mild conditions, a broad substrate scope, and easily prepared substrates, providing a simple and efficient access to a variety of ketonitriles.
The first example of the Pd-catalyzed addition of organoboron reagents to dinitriles, as an efficient means of preparing 2,5-diarylpyrroles and 2,6-diarylpyridines, has been discussed here. Furthermore, the highly selective carbopalladation of dinitriles with organoboron reagents to give long-chain ketonitriles has been developed as well. Based on the broad scope of substrates, excellent functional