Reductive Coupling between C–N and C–O Electrophiles
作者:Rong-De He、Chun-Ling Li、Qiu-Quan Pan、Peng Guo、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1021/jacs.9b05224
日期:2019.8.14
The cross-electrophile reaction is a promising strategy for C-C bond formation. Recent studies have focused mainly on reactions with organic halides. Here we report a coupling reaction between C-N and C-O electrophiles that demonstrates the possibility of constructing a C-C bond via C-N and C-O cleavage. Several reactions between benzyl/aryl ammonium salts and vinyl/aryl C-O electrophiles have been
交叉亲电反应是 CC 键形成的一个有前景的策略。最近的研究主要集中在与有机卤化物的反应上。在这里,我们报告了 CN 和 CO 亲电试剂之间的偶联反应,证明了通过 CN 和 CO 裂解构建 CC 键的可能性。已经研究了苄基/芳基铵盐和乙烯基/芳基 CO 亲电试剂之间的几种反应。初步机理研究表明,苄基铵是通过自由基机制活化的。
Construction of C–C Bond via C–N and C–O Cleavage
作者:Xiaobo Pang、Rong-De He、Xing-Zhong Shu
DOI:10.1055/s-0039-1691525
日期:2020.4
possibility of construction of C–C bond via C–N and C–O cleavage. A number of reactions between benzyl ammoniums and vinyl acetates, aryl ammoniums and vinyl acetates, and benzyl ammoniums and aryl C–O electrophiles have been studied. We also disclosed that benzyl ammonium salts can be activated by low-valent nickel to be radicals. 1 Introduction 2 Cross-Coupling of C–N and C–O Electrophiles 3 Summary
Construction of Polysubstituted Olefins through Ni-Catalyzed Direct Activation of Alkenyl CO of Substituted Alkenyl Acetates
作者:Chang-Liang Sun、Yang Wang、Xiao Zhou、Zhen-Hua Wu、Bi-Jie Li、Bing-Tao Guan、Zhang-Jie Shi
DOI:10.1002/chem.200902785
日期:2010.5.25
Reliable companion: For the first time cross‐coupling between alkenyl acetates and arylboroxines/PhZnCl has been developed via Ni catalysis. Alkenyl acetates could be well‐differentiated from aryl acetates (see scheme). This reliable method provides a convenient pathway to construct polysubstituted styrene derivatives.
π-Mediated rearrangements and 1,2-H shifts of indanylcarbenes
作者:Robert A. Moss、Wei Ma、Ronald R. Sauers
DOI:10.1039/a809769k
日期:——
Absolute rate constants determined for 1,2-C and 1,2-H migrations of cyclobutyl-, cyclopentyl-, benzocyclobutenyl- and benzocyclopentenyl-(chloro)- or -(acetoxy)-carbenes reveal that âphenylâ carbon migrations are preferred to alternative 1,2-C shifts due to Ï-electronic effects.
The enantioselective catalytic hydrogenation of N-(3,4-dihydronaphthalen-2-yl) amides (1) with rhodium catalysts bearing phosphine-phosphite ligands 4 has been studied. A wide catalyst screening, facilitated by the modular structure of 4, has found a highly enantioselective catalyst for this reaction. This catalyst gives a 93% ee in the hydrogenation of la and also produces high enantioselectivities, ranging from 83 to 93% ee, in the hydrogenation of several OMe- and Br- substituted substrates. In contrast, the structurally related enol esters 2 are very reluctant to undergo hydrogenation. A coordination study of the representative enamide Id has shown an unusual eta(6)-arene coordination mode, over the typical O,C,C chelating mode for enamides, as the preferred one for this substrate in a Rh(I) complex. Deuteration reactions of 1c,d indicate a clean syn addition of deuterium to the double bond without an isotopic effect on the enantioselectivity.