Acid-Enabled Palladium-Catalyzed β-C(sp<sup>3</sup>)–H Functionalization of Weinreb Amides
作者:Liming Yang、Henan Xie、Guanghui An、Guangming Li
DOI:10.1021/acs.joc.1c00781
日期:2021.6.4
with weakly coordinating groups normally requires a transient directing group or presynthesized nitrogen-based strong coordinating ligands. Herein, we report Pd(II)-catalyzed C(sp3)–H arylation and alkenylation of Weinreb amides. A commercially available, inexpensive sulfonic acid was employed to enhance the coordination of the catalyst with weak-coordinating substrates by increasing the electrophilicity
Sunlight-Driven Synthesis of Triarylethylenes (TAEs) via Metal-Free Mizoroki-Heck-Type Coupling
作者:Louis Onuigbo、Carlotta Raviola、Andrea Di Fonzo、Stefano Protti、Maurizio Fagnoni
DOI:10.1002/ejoc.201800883
日期:2018.10.17
The preparation of substituted triarylethylenes (TAEs) was achieved under metal‐ and (photo)catalyst‐free conditions, starting from photoactivated arylazo sulfones.
在无金属和(光)催化剂的条件下,从光活化的芳基偶氮砜开始,制备了取代的三芳基乙烯(TAE)。
Functionalization of Olefinic C−H Bonds by an Aryl‐to‐Vinyl 1,4‐Nickel Migration/Reductive Coupling Sequence
作者:Jingjie Yang、Zhuofan Gui、Yuli He、Shaolin Zhu
DOI:10.1002/anie.202304713
日期:2023.7.10
An unprecedented aryl-to-vinyl 1,4-nickel/hydride shift process with further subsequent selective reductive cross-coupling with a wide variety of electrophiles has been developed. This 1,4-nickel migration/reductive coupling sequence provides a facile access to diverse alkenyl C−H-functionalized products under mild conditions and with overall good selectivity.
The Stille Reaction of 1,1-Dibromo-1-alkenes: Preparation of Trisubstituted Alkenes and Internal Alkynes
作者:Wang Shen、Le Wang
DOI:10.1021/jo991116k
日期:1999.11.1
The Stille reaction of 1,1-dibromo-1-alkenes 1 with aryl- and vinylstannanes produces different products depending on the reaction conditions. When the reaction is run in toluene or 1,4-dioxane with tris(2-furyl)phosphine (TFP) as the ligand, (Z)-bromoalkenes 2 are obtained stereospecifically in good to excellent yields with most substrates. However, 2-aryl-1,1-dibromo-1-alkenes (1e,1g) having an electron-donating