Aryl to Aryl Palladium Migration in the Heck and Suzuki Coupling of o-Halobiaryls
摘要:
A novel 1,4-palladium migration between the o- and o'-positions of biaryls has been observed in organopalladium intermediates derived from o-halobiaryls. The organopalladium intermediates generated by this migration have been trapped either by a Heck reaction employing ethyl acrylate or by Suzuki cross-coupling using arylboronic acids. This palladium migration can be activated or deactivated by choosing the appropriate reaction conditions. Chemical and computational evidence supports the presence of an equilibrium that correlates with the C-H acidity of the available arene positions.
Novel 1,4-Palladium Migration in Organopalladium Intermediates Derived from o-Iodobiaryls
摘要:
A novel 1,4-palladium migration in organopalladium intermediates derived from o-iodobiaryls has been observed under modified Heck reaction conditions. This migration process can be switched "on" or "off" by simply choosing the appropriate reaction conditions.
1‐Alkynyltriazenes as Functional Analogues of Ynamides
作者:Florian G. Perrin、Gregor Kiefer、Loïc Jeanbourquin、Sophie Racine、Daniele Perrotta、Jérôme Waser、Rosario Scopelliti、Kay Severin
DOI:10.1002/anie.201507033
日期:2015.11.2
The chemical reactivity of 1‐alkynyltriazenes has been investigated and is found to parallel the reactivity of ynamides. The similarity in reactivity of these two classes of compounds is demonstrated by addition reactions with acids, by cycloaddition reactions with ketenes, tetracyanoethene, and cyclopropanes, as well as by intramolecular cyclization reactions. The presence of reactive triazene groups