An efficient and simple palladium-catalyzed approach for the synthesis of aryl ketones from low-cost nitriles and arylhydrazines using molecular oxygen (O2) as sole oxidant via C–N bond cleavage is reported. Various aryl ketones were synthesized in moderate to good yields under mild conditions. A possible mechanism involving the PdII/Pd0 catalytic cycle process is depicted, and a cationic palladium
据报道,一种有效且简单的钯催化方法可通过低成本的腈和芳肼,使用分子氧(O 2)作为唯一氧化剂通过C–N键断裂来合成芳基酮。在温和的条件下以中等至良好的产率合成了各种芳基酮。描述了涉及Pd II / Pd 0催化循环过程的可能机理,并通过ESI-MS检测了阳离子钯中间体。
Palladium catalyzed addition of arylboronic acid or indole to nitriles: synthesis of aryl ketones
Arylketones can be synthesized conveniently by a palladiumcatalyzedaddition of arylboronic acid to nitriles in aqueous triflic acid. This catalytic system was extended to the addition of unprotected indoles to nitriles under a slightly modified condition to produce 3-acyl indoles in good yields.
An acylative Suzuki coupling of activated amides with aryl boronic acids has been reported via palladium-catalyzed CN bond cleavage. This protocol demonstrate amides can be activated by an atom-economic and cheap succinimide, which can be efficiently utilized to synthesize broad array of diaryl ketones in moderate to good yields.
Rapidly Activating Pd-Precatalyst for Suzuki–Miyaura and Buchwald–Hartwig Couplings of Aryl Esters
作者:Amira H. Dardir、Patrick R. Melvin、Ryan. M. Davis、Nilay Hazari、Megan Mohadjer Beromi
DOI:10.1021/acs.joc.7b02588
日期:2018.1.5
for the effective cross-coupling of ester substrates. Utilizing a recently discovered precatalyst, Pd-catalyzed Suzuki–Miyaura and Buchwald–Hartwig reactions involving cleavage of the C(acyl)–Obond of aryl esters that proceed under mild conditions are reported. The Pd(II) precatalyst is highly active because it is reduced to the Pd(0) active species more rapidly than previous precatalysts.