The arylation of pyrazole and derivatives can be achieved by coupling arenediazonium species (formed in situ fromanilines) by using a catalytic system that employs low‐toxicity and inexpensive copper metal under very mild and ligand‐free conditions (T=20 °C). From other nitrogenheterocycles, the presence of an additive (NBu4I) significantly improves the efficiency of the catalytic system. These results
Mechanochemical Ruthenium-Catalyzed Hydroarylations of Alkynes under Ball-Milling Conditions
作者:Hanchao Cheng、José G. Hernández、Carsten Bolm
DOI:10.1021/acs.orglett.7b02973
日期:2017.12.1
mechanochemical ruthenium-catalyzed hydroarylations of alkynes with acetanilides lead to trisubstituted alkenes. Only catalytic amounts of pivalic acid or copper acetate are required, and without the need for external heating, the reaction times are shorter than those of their solution-based counterpart. Mechanochemical oxidative annulations through palladium-catalyzed intramolecular amination convert the products
Ruthenium‐Catalyzed Remote Difunctionalization of Nonactivated Alkenes for Double <i>meta</i>‐C(sp<sup>2</sup>)−H/C‐6(sp<sup>3</sup>)−H Functionalization
The ruthenium-catalyzed remote-difunctionalization of nonactivated alkenes for double meta-C(sp2)−H/C-6(sp3)−H transformations was achieved by metalla-hydrogen atom transfer (MHAT) and σ-activation, featuring excellent site- and regio-selectivity, along with ample scope.