Rhodium(III)-Catalyzed Synthesis of Isoquinolines from Aryl Ketone<i>O</i>-Acyloxime Derivatives and Internal Alkynes
作者:Pei Chui Too、Yi-Feng Wang、Shunsuke Chiba
DOI:10.1021/ol102504b
日期:2010.12.17
isoquinolines from aryl ketone O-acyloxime derivatives and internal alkynes has been developed using [Cp*RhCl2]2−NaOAc as the potential catalyst system. The present transformation is carried out by a redox-neutral sequence of C−H vinylation via ortho-rhodation and C−N bond formation of the putative vinyl rhodium intermediate on the oxime nitrogen, where the N−O bond of oxime derivatives could work as an internal
A synthetic method for azaheterocycles from aryl ketone O-acetyl oximes and internalalkynes has been developed by using the Cu(OAc)2–[Cp*RhCl2]2 bimetallic catalytic system. The reactions proceeded with both of anti- and syn-isomers of oximes with a wide scope of substituents. The Cu–Rh bimetallic system could be applied for the synthesis of isoquinolines as well as β-carboline, furo[2.3-c]pyridine
利用Cu(OAc)2- [Cp * RhCl 2 ] 2双金属催化体系,开发了一种由芳基酮O-乙酰基肟和内部炔烃合成氮杂杂环的方法。该反应在具有广泛取代基的肟的反-和顺-异构体上进行。Cu-Rh双金属系统可用于合成异喹啉以及β-咔啉,呋喃[2.3- c ]吡啶,吡咯并[2,3- c ]吡啶和噻吩并[2,3- c ]吡啶衍生物。
Cobalt-Catalyzed Formal [4+2] Cycloaddition of α,α′-Dichloro-<i>ortho</i>-Xylenes with Alkynes
作者:Kimihiro Komeyama、Yuji Okamoto、Ken Takaki
DOI:10.1002/anie.201406807
日期:2014.10.13
A formal [4+2] cycloaddition of α,α′‐dichloro‐ortho‐xylenes with various alkynes has been developed using a low‐valent cobalt catalyst. The transformation has a wide substrate scope and high functional‐group tolerance and led to 1,4‐dihydronaphthalenes. The formed cycloadducts were easily aromatized with MnO2 under air. A mechanistic investigation suggests that the transformation proceeds through a
Isolation of Cp*Co<sup>III</sup>
-Alkenyl Intermediate in Efficient Cobalt-Catalyzed C−H Alkenylation with Alkynes
作者:Malay Sen、Nimmakuri Rajesh、Balakumar Emayavaramban、J. Richard Premkumar、Basker Sundararaju
DOI:10.1002/chem.201705183
日期:2018.1.9
A general and efficient procedure for C−H alkenylation of arenes with a broad substrate scope catalyzed by Cp*CoIII was demonstrated with alkynes. A highly selective mono‐alkenylation and sequential bis‐C−H bond functionalization was displayed to exemplify the versatility of the cobalt catalyst. Isolation of cationic Cp*CoIII–alkenyl intermediate was achieved under identical catalytic conditions to
用炔烃证明了由Cp * Co III催化的具有广泛底物范围的芳烃的CH链烯基化的通用有效方法。高选择性的单烯基化和顺序的双CH键功能化显示了钴催化剂的多功能性。在相同的催化条件下实现了阳离子Cp * Co III-烯基中间体的分离,以进一步建立拟议的途径。
Rhodium(III)-Catalyzed Synthesis of Pyridines from α,β-Unsaturated Ketoximes and Internal Alkynes
beta-unsaturated oximes and internalalkynes has been developed using [Cp*RhCl2](2)-CsOPiv as the catalyst system. The present transformation is carried out by a redox-neutral sequence of vinylic C-H rhodation, alkyne insertion, and C-N bond formation of the putative vinyl rhodium intermediate with the oxime nitrogen, where the N-Obond of oxime derivatives could work as an internaloxidant to maintain the catalytic
使用 [Cp*RhCl2](2)-CsOPiv 作为催化剂体系开发了一种从 α、β-不饱和肟和内部炔烃合成高度取代的吡啶的方法。目前的转化是通过乙烯基 CH 化、炔插入和 CN 键形成的氧化还原中性序列与肟氮形成推定的乙烯基铑中间体,其中肟衍生物的 NO 键可以作为内部氧化剂来维持催化循环。