Palladium-Catalyzed Late-Stage Direct Arene Cyanation
作者:Da Zhao、Peng Xu、Tobias Ritter
DOI:10.1016/j.chempr.2018.09.027
日期:2019.1
Methods for direct benzonitrile synthesis are sparse, despite the versatility of cyano groups in organic synthesis and the importance of benzonitriles for the dye, agrochemical, and pharmaceutical industries. We report the first general late-stage aryl C–H cyanation with broad substrate scope and functional-group tolerance. The reaction is enabled by a dual-ligand combination of quinoxaline and an
Site-selective functionalization of C-H bonds in small complex molecules is a long-standing challenge in organic chemistry. Herein, we report a broadly applicable and site-selective aromatic C-H dibenzothiophenylation reaction. The conceptual advantage of this transformation is further demonstrated through the two-step C-H [18 F]fluorination of a series of marketed small-molecule drugs.
nitrogen donor conveniently transforms a variety of ketones and aldehydes into amides. Science, this issue p. 281 An acetylated hydroxylamine conveniently derived in situ from nitromethane can turn ketones and aldehydes into amides. The Schmidt reaction has been an efficient and widely used synthetic approach to amides and nitriles since its discovery in 1923. However, its application often entails
A catalytic activation of bulk chemical nitromethane (MeNO2) enables the facile synthesis of amides and nitriles from ketone, aldehyde, and alkyne substrates. This method eliminates the need for stoichiometric reductants or activators, opening up new possibilities for MeNO2 as a nitrogen source in organicsynthesis.