A copper-catalyzed cycloamination of α-Csp3–H bond of N-aryl ketimines with sodium azide has been developed. This methodology provides an efficient access to quinoxalines and features mild reaction conditions and readily available ketimines with diverse functional group tolerance.
A silica-supported titanium catalyst for heterogeneous hydroamination and multicomponent coupling reactions
作者:Kelly E. Aldrich、Aaron L. Odom
DOI:10.1039/c9dt01835b
日期:——
bound to the surface, on average, through a single O–Si–Ti linkage. This material was tested for its properties as a catalyst for C–N bond forming reactions and was found to be a competent alkyne hydroamination and iminoamination catalyst. For iminoamination, which is the 3-component coupling of an alkyne, primary amine, and isonitrile, this heterogeneouscatalyst was able to carry out some catalyses
Pentacoordinate zirconium complexes 5 and 7 stabilized by amine-bridged bis(phenolato) ligands are more active than hexacoordinate complexes 1–4 in catalyzing intermolecular hydroamination reactions.
microwave technology, it is possible to achieve turnover frequencies TOF > 10 h−1. Furthermore, when Cp2TiMe2 is used as the catalyst, hydroamination products of terminal alkynes can be isolated in reasonable yields for the first time. The addition of amines to terminal alkynes gives access to both the Markovnikov and the anti-Markovnikov products. Observed regioselectivities are different for terminal
Titanium-Catalyzed Hydroamination and Multicomponent Coupling with a Simple Silica-Supported Catalyst
作者:Kelly E. Aldrich、Aaron L. Odom
DOI:10.1021/acs.organomet.8b00313
日期:2018.12.10
Hydroamination and multicomponent coupling reactionscatalyzed by homogeneous Ti(IV) complexes can produce valuable imines, amines, and other nitrogen-containingorganic building blocks. Typically catalysts for this transformation are very sensitive to ancillary ligand design and often suffer from catalyst deactivation, necessitating use in a single reaction. Here, we have attempted to address these