C(sp2)–H bond oxidation of oximes or azobenzenes with diverse carboxylic acids has been developed. In contrast to the previous catalytic systems, this protocol features mild conditions (close to room temperature for most cases) and a broad substrate scope (up to 64 examples), thus constituting a versatile method to directly prepare diverse O-aryl esters. Moreover, the superiority of the nitrate additive
Rhodium(III)-Catalyzed Amidation of Aryl Ketone<i>O</i>-Methyl Oximes with Isocyanates by CH Activation: Convergent Synthesis of 3-Methyleneisoindolin-1-ones
作者:Bing Zhou、Wei Hou、Yaxi Yang、Yuanchao Li
DOI:10.1002/chem.201204448
日期:2013.4.8
Going green! The rhodium(III)‐catalyzed annulation of arylketone O‐methyl oximes with isocyanates for the synthesis of 3‐methyleneisoindolin‐1‐ones is reported (see scheme). This reaction exhibits high regioselectivity, functional‐group tolerance, and broad substrate scope, without the use of additives or production of environmentally hazardous waste.
Rhodium(III)-Catalyzed Coupling of Arenes with Cyclopropanols via C–H Activation and Ring Opening
作者:Xukai Zhou、Songjie Yu、Lingheng Kong、Xingwei Li
DOI:10.1021/acscatal.5b02414
日期:2016.2.5
Rhodium-catalyzed C–Hactivation of arenes has been established as an important strategy for the rapid construction of new bonds. On the other hand, ring-opening of readily available cyclopropanols has served as a driving force for the coupling with various nucleophiles and electrophiles. Nevertheless, these two important areas evolved separately, and coupling of arenes with cyclopropanols viaC–Hactivation has
A highly para‐selective CAr−H difluoromethylation of ketoxime ethers under ruthenium catalysis has been developed. A wide variety of ketoxime ethers are compatible with the reaction, which leads to the corresponding para‐difluoromethylated products in moderate to good yield. A mechanistic study clearly showed that chelation‐assisted cycloruthenation is the key factor in the para selectivity of the
已经开发了在钌催化下酮肟醚的高度对位选择性C Ar -H二氟甲基化。各种各样的酮肟醚均可与该反应相容,从而以中等至良好的产率产生相应的对二氟甲基化产物。一项机理研究清楚地表明,螯合辅助的环化钌是影响酮肟醚二氟甲基化对位选择性的关键因素。使用密度泛函理论来获得对位选择性的理论理解。#
Ruthenium‐Catalyzed Oxidant‐Free Allylation of Aromatic Ketoximes with Allylic Acetates at Room Temperature
Substituted aromaticketoximes reacted efficiently with allylicacetates in the presence of [RuCl2(p‐cymene)]2} and AgSbF6 in 1,2‐dichloroethane at ambient temperature, providing ortho‐allyl aromaticketoximes in a highly regioselective manner without an oxidant. In the reaction, the acetate group of allyl acetate acts as a base to activate the CH bond of aromatics. Later, ortho‐allyl aromatic ketoximes