5-Iodo-1,2,3-triazolium-based multidentate halogen-bond donors as activating reagents
作者:Florian Kniep、Laxmidhar Rout、Sebastian M. Walter、Heide K. V. Bensch、Stefan H. Jungbauer、Eberhardt Herdtweck、Stefan M. Huber
DOI:10.1039/c2cc34392d
日期:——
Bi- and tridentate polycationic halogen bond donors based on 5-iodo-1,2,3-triazolium groups have been synthesized by 1,3-dipolar cycloaddition reactions. These halogen-based Lewis acids have been evaluated as activators in a halide-abstraction benchmark reaction.
Catalytic Activation of Imines by Chalcogen Bond Donors in a Povarov [4+2] Cycloaddition Reaction
作者:Tim Steinke、Patrick Wonner、Richard M. Gauld、Sascha Heinrich、Stefan M. Huber
DOI:10.1002/chem.202200917
日期:2022.8.22
Tellurium-based chalcogenbonding catalysts successfully activate a Povarov [4+2] cycloaddition with catalyst loadings as low as 1 mol %, with different substrates, and in different solvents. Furthermore, new chiral chalcogenbonding catalysts were introduced and tested in this reaction, but only racemic mixtures of the product were obtained.