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。
Cross‐Electrophile C(sp
<sup>2</sup>
)−Si Coupling of Vinyl Chlorosilanes
作者:Jicheng Duan、Ke Wang、Guang‐Li Xu、Shaolin Kang、Liangliang Qi、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202010737
日期:2020.12.14
C−Si bond remains unexplored. Here we report a cross‐electrophile Csp2‐Si coupling reaction of vinyl/aryl electrophiles with vinyl chlorosilanes. This new protocol offers an approach for facile and precise synthesis of organosilanes with high molecular diversity and complexity from readily available materials. The reaction proceeds under mild and non‐basic conditions, demonstrating a high step economy
Cross‐Electrophile Coupling between Aryl/Vinyl Triflates and Vinyl Tosylates for the Synthesis of
<i>gem</i>
‐Difluoroalkenes via Ni/Pd Cooperative Catalysis
作者:Baojian Xiong、Yue Li、Jinyu Zhang、Jiangjun Liu、Xuemei Zhang、Zhong Lian
DOI:10.1002/adsc.202101388
日期:2022.3
A dual nickel-/palladium-catalyzed direct gem-difluorovinylation of readily available aryl/vinyltriflates with substituted gem-difluorovinyl tosylates is presented. This protocol affords various diaryldifluoroalkene, arylalkyldifluoroalkene and 1,1-difluoro-2-substituted-1,3-dienes under mild reaction conditions with excellent functional group compatibility, and provides a potential pathway to the
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
Nickel‐Catalyzed Reductive C−Ge Coupling of Aryl/Alkenyl Electrophiles with Chlorogermanes
作者:Pei‐Feng Su、Ke Wang、Xuejing Peng、Xiaobo Pang、Peng Guo、Xing‐Zhong Shu
DOI:10.1002/anie.202112876
日期:2021.12.13
A new C−Ge bond-forming framework was established, which bridges a gap between a recently developed mild coupling technique and organogermane chemistry. The method provides a mild approach for the synthesis of both aryl and alkenyl germanes, with improved molecular diversity and structural complexity, using readily available carbon electrophiles and chlorogermanes as starting materials.
A direct borylation of aryl halides or triflates with dialkoxyborane was investigated. The coupling reaction of pinacolborane with aryl halides or triflates in the presence of a catalytic amount of PdCl2(dppf) together with a base provided arylboronates in high yields. The product distributions were strongly dependent on the base employed, and the tertiary amine, especially Et3N, was effective for the selective formation of the boron-carbon bond. The reaction conditions were so mild that arylboronates having a variety of functional groups such as carbonyl, cyano, and nitro groups were readily prepared.