Directed Palladium-Catalyzed γ-C(sp<sup>3</sup>)–H Alkenylation of (Aza and Oxa) Cyclohexanamines with Bromoalkenes: Bromide Precipitation as an Alternative to Silver Scavenging
作者:Karthik Gadde、Narendraprasad Reddy Bheemireddy、Juliane Heitkämper、Ainara Nova、Bert U. W. Maes
DOI:10.1021/acscatal.3c04152
日期:2024.1.19
energy span of the reaction. Co-catalyst KOPiv plays a pivotal role by exchanging bromide for pivalate in the complex, via precipitation of the KBr coproduct. This removal of bromide from the reaction media decreases the energy span, avoiding the use of superstoichiometric silversalt reagents and allowing decoordination of the reaction product. In addition, pivalate facilitates the C(sp3)–H bond activation
Methylene sp3 carbon–hydrogenbondactivation of N-picolinoylcycloalkylamines provides a useful method for synthesizing cis-3-arylated cycloalkylamine derivatives. Pd(II) species catalyzed the γ-arylation of N-picolinoylcycloalkylamines with aryl iodides in the presence of silver carbonate to afford cis-3-arylated N-picolinoylalkylamines in up to 87% yield. Hydrolysis of the amide linkage to give the