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。
Rhodium(III)-catalyzed N-directed ortho C–H activation and subsequent roll-over C–H activation represents an important strategy to synthesize fused polycyclic compounds. Herein, the novel methodology broadens the scope of the coupling partner to alkenes, which working smoothly with 7-azaindoles has been proven to be an efficient and atom-economical strategy to access complex π-conjugated 7-azaindole
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
Reductive Alkylation of Alkenyl Acetates with Alkyl Bromides by Nickel Catalysis
作者:Rong‐De He、Yunfei Bai、Guan‐Yu Han、Zhen‐Zhen Zhao、Xiaobo Pang、Xiaobo Pan、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202114556
日期:2022.1.21
A new C−C bond-forming reaction between alkenyl acetates and alkyl bromides was achieved by reductive nickel catalysis. This method offers very mild reaction conditions for facile and precise synthesis of structurally versatile aliphatic alkenes using readily available and stable alkenyl reagents. It allows for a gram-scale reaction and modification of biologically active molecules, and it affords
Chirality preservation in pyrrolinone iron tetracarbonyl complexes ? a route to enantiopure 5-substituted pyrrolinones
作者:Johan C. P. Hopman、Henk Hiemstra、W. Nico Speckamp
DOI:10.1039/c39950000617
日期:——
The enantiopure iron complex 4 reacts under the influence of BF3·OEt2 with allylsilanes and enol acetates through a cationic intermediate in which the chirality of 4 is preserved, yielding enantiopure 5-substituted 3-pyrrolin-2-ones.
chiral disphosphines with tunable dihedral angles (TunaPhos) have been used for asymmetric hydrogenation of enolacetates and dihedral-angle-dependent enantioselectivities were observed. C2-TunaPhos has been proved to be effective for Ru-catalyzed asymmetric hydrogenation of electron-deficient and other enolacetates.