Synthesis of Arylamides via Ritter-Type Cleavage of Solid-Supported Aryltriazenes
作者:Nicolai A. Wippert、Nicole Jung、Stefan Bräse
DOI:10.1021/acscombsci.9b00096
日期:2019.8.12
combined with an on-bead cross-coupling reaction of halogen-substituted aryltriazenes with pyrazoles. Additionally, the synthesis of on-bead generated arylboronic ester-substituted triazenes was shown. The developed procedure was further expanded to use other commercially available nitriles, such as acrylonitrile, benzonitrile, and chlorinated alkyl nitriles as suitable reagents for a Ritter-type cleavage
A novel access to deuterated and D3CO-substituted arenes has been developed using immobilized triazenes as precursors. The linker system and the deuterating cleavage methodology could be shown to be compatible with various functional groups and are therefore suitable for the synthesis of derivatives only hardly available via comparable protocols.
spectroscopy were shown for the on‐bead monitoring of diverse reactions. Raman spectroscopy was used for the development of new procedures on established linker systems, the real‐time observation of several reactions on solid phases and the estimation of the reaction time for a new cleavage strategy. Selected conversions on solid phases, such as the on‐bead conversion of functional groups and the attachment
The conversion of dithianylium cations into alpha-azo ketene dithioacetals via addition of polymer-bound diazonium precursors is shown. This new procedure allows the synthesis of a-azo ketene dithioacetals in one step within 2-90 min at rt and yields highly pure compounds that do not have to be purified in most cases. The alpha-azo ketene dithioacetals obtained have been shown to be valuable intermediates for the synthesis of hydrazones, alpha-halogenated alpha-azo ketene dithioacetals, and azo-functionalized dienes.