We developed palladium-catalyzed oxidative coupling of olefins with N-acyl 2-aminobiaryls through a sequence of ortho C–H bond activation/alkene insertion/reductive elimination. Furthermore, we controlled the selectivity of mono- and bis-alkenylation products with the solvent effect. The developed protocol was promising for a broad substrate scope ranging from activated olefins with a wide variety
Pd-Catalyzed Sequential CC and CN Bond Formations for the Synthesis of N-Heterocycles: Exploiting Protecting Group-Directed CH Activation under Modified Reaction Conditions
作者:Byung Seok Kim、Sun Young Lee、So Won Youn
DOI:10.1002/asia.201100024
日期:2011.8.1
addition reaction of N‐Ts‐2‐arylanilines with activated olefins has been achieved at ambient temperature under the newly defined reaction conditions. This process highlighted the directing effect of the N‐protecting group in CHactivation, displayed broad substrate scope with wide functional group compatibility; thus rendering a straightforward entry to a wide variety of N‐heterocycles such as d
Ag(i)-catalyzed oxidative decarboxylative gem-difluoromethylenation of difluoroacetates with isonitriles has been developed for the formation of C–CF2 bonds.
Ag(i)催化的氧化脱羧gem-二氟甲基化反应已经被开发用于形成C–CF2键。
Visible-light-induced tandem radical addition–cyclization of 2-aryl phenyl isocyanides catalysed by recyclable covalent organic frameworks
作者:Shuyang Liu、Wenna Pan、Songxiao Wu、Xiubin Bu、Shigang Xin、Jipan Yu、Hao Xu、Xiaobo Yang
DOI:10.1039/c9gc00022d
日期:——
A visible-light-induced tandemradicaladdition–cyclization sequence via 2-aryl phenyl isocyanides as the starting material and two-dimensional covalent organic frameworks (2D-COFs) as the photocatalyst was developed, delivering multifarious 6-substituted phenanthridines in high yields. Benefitting from the utilization of a heterogeneous photocatalyst, this protocol features easy catalyst separation
attractive challenge. Herein a novel palladium-catalyzed [4 + 3] decarboxylative annulation of 2-iodobiphenyls with 2-(2-halophenyl)acrylic acids is reported, which provides an efficient approach for assembling various tribenzo[7]annulenes via a C–H activation and decarboxylation process. Moreover, tribenzo[7]annulenes can be also synthesized via a [2 + 2 + 3] decarboxylative annulation strategy by employing