Room-Temperature Amination of Deactivated Aniline and Aryl Halide Partners with Carbonate Base Using a Pd-PEPPSI-IPent<sup>Cl</sup>-<i>o</i>-Picoline Catalyst
作者:Matthew Pompeo、Jennifer L. Farmer、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201310457
日期:2014.3.17
state‐of‐the‐art protocols for the coupling of unreactive amines (e.g., electron‐poor anilines) with deactivated oxidative‐addition partners (e.g., electron‐rich and/or hindered aryl chlorides) involve strong heating (usually >100 °C) and/or tert‐butoxide base, and even then not all couplings are successful. The aggressive base tert‐butoxide reacts with and in many instances destroys the typical functional
当前用于将未反应的胺(例如,电子贫乏的苯胺)与失活的氧化加成伙伴(例如,富电子和/或受阻的芳基氯化物)偶联的最新技术方案涉及强力加热(通常> 100° C)和/或叔丁氧基碱,即使如此,并非所有的偶联都成功。侵蚀性的叔丁醇叔丁基醚与之反应,并在许多情况下破坏了大多数有机分子的功能所必需的典型官能团,例如羰基,酯,腈,酰胺,醇和胺。当在室温下仅使用碳酸盐碱时,本文所述的新型催化剂Pd-PEPPSI-IPent Cl - o -picoline能够胺化严重失活的偶合对。
Photoinduced Reduction of Nitroarenes and Tandem C–N Cross-Coupling with Haloarenes
作者:Haoshi Bao、Leifeng Wang
DOI:10.1021/acs.orglett.3c03656
日期:2023.12.15
photocatalytic C–N cross-coupling of nitroarenes with haloarenes has been developed using simple and cheap Ni(acac)2 as a cocatalyst. The reaction is confirmed as a stepwise process: (1) metal free photoinducedreduction of nitroarenes into aniline derivatives and (2) photo- and Ni-catalyzed C–N cross-coupling of anilines with haloarenes. The reaction conditions are simple and mild, giving high-value diarylamines
Palladate Precatalysts for the Formation of C–N and C–C Bonds
作者:Caroline M. Zinser、Katie G. Warren、Fady Nahra、Abdullah Al-Majid、Assem Barakat、Mohammad Shahidul Islam、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1021/acs.organomet.9b00326
日期:2019.7.22
A series of imidazolium-based palladate precatalysts has been synthesized and the catalytic activity of these air- and moisture-stable complexes evaluated as a function of the nature of the imidazolium counterion. These precatalysts can be converted under catalytic conditions to Pd-NHC species capable of enabling the Buchwald-Hartwig aryl amination and the alpha-arylation of ketones. Both reactions can be carried out efficiently under very mild operating conditions. The effectiveness of the protocol was tested on functionality-laden substrates.